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Solve Equations Using the Subtraction and Addition Properties of Equality

In the following exercises, determine whether the given value is a solution to the equation.

Is y = 1 3 a solution of 4 y + 2 = 10 y ?

yes

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Is x = 3 4 a solution of 5 x + 3 = 9 x ?

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Is u = 1 2 a solution of 8 u 1 = 6 u ?

no

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Is v = 1 3 a solution of 9 v 2 = 3 v ?

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In the following exercises, solve each equation.

p + 2.4 = −9.3

p = −11.7

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x 15 = −42

x = −27

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q + 3 4 = 1 2

q = 1 4

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y 3 4 = 3 5

y = 27 20

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Solve Equations that Need to be Simplified

In the following exercises, solve each equation.

9 x + 5 8 x + 14 = 20

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6 x + 8 5 x + 16 = 32

8

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−6 x 11 + 7 x 5 = −16

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−8 n 17 + 9 n 4 = −41

−20

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3 ( y 5 ) 2 y = −7

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4 ( y 2 ) 3 y = −6

2

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8 ( u + 1.5 ) 7 u = 4.9

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5 ( w + 2.2 ) 4 w = 9.3

1.7

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−5 ( y 2 ) + 6 y = −7 + 4

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−8 ( x 1 ) + 9 x = −3 + 9

−2

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3 ( 5 n 1 ) 14 n + 9 = 1 2

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2 ( 8 m + 3 ) 15 m 4 = 3 5

−4

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( j + 2 ) + 2 j 1 = 5

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( k + 7 ) + 2 k + 8 = 7

6

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6 a 5 ( a 2 ) + 9 = −11

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8 c 7 ( c 3 ) + 4 = −16

−41

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8 ( 4 x + 5 ) 5 ( 6 x ) x = 53

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6 ( 9 y 1 ) 10 ( 5 y ) 3 y = 22

28

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Translate to an Equation and Solve

In the following exercises, translate to an equation and then solve.

Five more than x is equal to 21 .

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The sum of x and −5 is 33 .

x + (−5) = 33; x = 38

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Ten less than m is −14 .

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Three less than y is −19 .

y − 3 = −19; y = −16

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The sum of y and −3 is 40 .

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Eight more than p is equal to 52 .

p + 8 = 52; p = 44

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The difference of 9 x and 8 x is 17 .

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The difference of 5 c and 4 c is 60 .

5 c − 4 c = 60; 60

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The difference of n and 1 6 is 1 2 .

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The difference of f and 1 3 is 1 12 .

f 1 3 = 1 12 ; 5 12

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The sum of −4 n and 5 n is −32 .

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The sum of −9 m and 10 m is −25 .

−9 m + 10 m = −25; m = −25

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Translate and Solve Applications

In the following exercises, translate into an equation and solve.

Pilar drove from home to school and then to her aunt’s house, a total of 18 miles. The distance from Pilar’s house to school is 7 miles. What is the distance from school to her aunt’s house?

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Jeff read a total of 54 pages in his English and Psychology textbooks. He read 41 pages in his English textbook. How many pages did he read in his Psychology textbook?

Let p equal the number of pages read in the Psychology book 41 + p = 54. Jeff read pages in his Psychology book.

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Pablo’s father is 3 years older than his mother. Pablo’s mother is 42 years old. How old is his father?

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Eva’s daughter is 5 years younger than her son. Eva’s son is 12 years old. How old is her daughter?

Let d equal the daughter’s age. d = 12 − 5. Eva’s daughter’s age is 7 years old.

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Allie weighs 8 pounds less than her twin sister Lorrie. Allie weighs 124 pounds. How much does Lorrie weigh?

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For a family birthday dinner, Celeste bought a turkey that weighed 5 pounds less than the one she bought for Thanksgiving. The birthday dinner turkey weighed 16 pounds. How much did the Thanksgiving turkey weigh?

21 pounds

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The nurse reported that Tricia’s daughter had gained 4.2 pounds since her last checkup and now weighs 31.6 pounds. How much did Tricia’s daughter weigh at her last checkup?

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Connor’s temperature was 0.7 degrees higher this morning than it had been last night. His temperature this morning was 101.2 degrees. What was his temperature last night?

100.5 degrees

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Melissa’s math book cost $22.85 less than her art book cost. Her math book cost $93.75 . How much did her art book cost?

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Ron’s paycheck this week was $17.43 less than his paycheck last week. His paycheck this week was $103.76 . How much was Ron’s paycheck last week?

$121.19

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Everyday math

Baking Kelsey needs 2 3 cup of sugar for the cookie recipe she wants to make. She only has 1 4 cup of sugar and will borrow the rest from her neighbor. Let s equal the amount of sugar she will borrow. Solve the equation 1 4 + s = 2 3 to find the amount of sugar she should ask to borrow.

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Construction Miguel wants to drill a hole for a 5 8 -inch screw. The screw should be 1 12 inch larger than the hole. Let d equal the size of the hole he should drill. Solve the equation d + 1 12 = 5 8 to see what size the hole should be.

d = 13 24

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Writing exercises

Is −18 a solution to the equation 3 x = 16 5 x ? How do you know?

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Write a word sentence that translates the equation y 18 = 41 and then make up an application that uses this equation in its solution.

Answers will vary.

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Self check

After completing the exercises, use this checklist to evaluate your mastery of the objectives of this section.

.

If most of your checks were:

…confidently. Congratulations! You have achieved the objectives in this section. Reflect on the study skills you used so that you can continue to use them. What did you do to become confident of your ability to do these things? Be specific.

…with some help. This must be addressed quickly because topics you do not master become potholes in your road to success. In math, every topic builds upon previous work. It is important to make sure you have a strong foundation before you move on. Who can you ask for help? Your fellow classmates and instructor are good resources. Is there a place on campus where math tutors are available? Can your study skills be improved?

…no—I don’t get it! This is a warning sign and you must not ignore it. You should get help right away or you will quickly be overwhelmed. See your instructor as soon as you can to discuss your situation. Together you can come up with a plan to get you the help you need.

Questions & Answers

I'm interested in biological psychology and cognitive psychology
Tanya Reply
what does preconceived mean
sammie Reply
physiological Psychology
Nwosu Reply
How can I develope my cognitive domain
Amanyire Reply
why is communication effective
Dakolo Reply
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
effective communication can lead to improved outcomes in various settings, including personal relationships, business environments, and educational settings. By communicating effectively, individuals can negotiate effectively, solve problems collaboratively, and work towards common goals.
it starts up serve and return practice/assessments.it helps find voice talking therapy also assessments through relaxed conversation.
miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
Wekolamo Reply
please i need answer
Wekolamo
because it helps many people around the world to understand how to interact with other people and understand them well, for example at work (job).
Manix Reply
Agreed 👍 There are many parts of our brains and behaviors, we really need to get to know. Blessings for everyone and happy Sunday!
ARC
A child is a member of community not society elucidate ?
JESSY Reply
Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
Simon Reply
compare and contrast skinner's perspective on personality development on freud
namakula Reply
Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
explain how nature and nurture affect the development and later the productivity of an individual.
Amesalu Reply
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
Zyryn Reply
good👍
Jonathan
and having a good philosophy of the world is like a sandwich and a peanut butter 👍
Jonathan
generally amnesi how long yrs memory loss
Kelu Reply
interpersonal relationships
Abdulfatai Reply
What would be the best educational aid(s) for gifted kids/savants?
Heidi Reply
treat them normal, if they want help then give them. that will make everyone happy
Saurabh
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Practice Key Terms 1

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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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