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Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
1. Solving Equations Using Addition or Subtraction
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Exercise 13 Page 131

Use the Addition Property of Equality to eliminate the subtraction.

a=19

Practice makes perfect
To solve the equation, we have to isolate a on one side. Using the Addition Property of Equality, we will add 6 to both sides of the equation. This will eliminate the subtraction and isolate a.
a - 6 = 13
AddEqn

LHS+6=RHS+6

a - 6 + 6 = 13 + 6
AddTerms

Add terms

a = 19
To check that this solution is correct, let's substitute a=19 into the original equation and simplify.
a - 6 = 13
Substitute

a= 19

19 - 6 ? = 13
SubTerm

Subtract term

13 = 13 âś“
Since the left-hand side and right-hand side are equal, a=19 is the correct solution.
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arrow_right Try It p.128-129
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Try It 2 (Page 128)
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arrow_right Self-Assessment for Concept & Skills p.129
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arrow_right Self-Assessment for Problem Solving p.130
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