Translate into an algebraic expression
less than If you missed this problem, review
Subtract Whole Numbers .
Determine whether a number is a solution of an equation
In
Solve Equations with the Subtraction and Addition Properties of Equality , we saw that a solution of an equation is a value of a variable that makes a true statement when substituted into that equation. In that section, we found solutions that were whole numbers. Now that we’ve worked with integers, we’ll find integer solutions to equations.
The steps we take to determine whether a number is a solution to an equation are the same whether the solution is a whole number or an integer.
How to determine whether a number is a solution to an equation.
Substitute the number for the variable in the equation.
Simplify the expressions on both sides of the equation.
Determine whether the resulting equation is true.
If it is true, the number is a solution.
If it is not true, the number is not a solution.
Determine whether each of the following is a solution of
ⓐ
ⓑ
ⓒ
Solution
ⓐ Substitute 4 for x in the equation to determine if it is true.
Multiply.
Subtract.
Since
does not result in a true equation,
is not a solution to the equation.
ⓑ Substitute −4 for x in the equation to determine if it is true.
Multiply.
Subtract.
Since
results in a true equation,
is a solution to the equation.
ⓒ Substitute −9 for x in the equation to determine if it is true.
Substitute −9 for x.
Multiply.
Subtract.
Since
does not result in a true equation,
is not a solution to the equation.
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