McGraw Hill Glencoe Algebra 1, 2012
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McGraw Hill Glencoe Algebra 1, 2012 View details
5. Inequalities Involving Absolute Value
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Exercise 57 Page 316

Use the Additive Property of Equality to eliminate the subtraction.

c=18

Practice makes perfect

To solve the equation, we have to isolate c on one side. Using the Additive Property of Equality, we will add 7 to both sides of the equation. This will eliminate the subtraction and isolate c.

c-7=11
c-7+7=11+7
c=18

To check that this solution is correct, substitute c=18 into the original equation and simplify.

c-7=11
18-7? =11
11=11 ✓

Since the left-hand side and right-hand side are equal, c=18 is the correct solution.