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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 6 Page 129

Use the Subtraction Property of Equality to eliminate the addition.

k=- 14.7

Practice makes perfect
To solve the equation, we have to isolate k on one side. Using the Subtraction Property of Equality, we will subtract 8.4 from both sides of the equation. This will eliminate the addition and isolate k.
k + 8.4 = - 6.3
SubEqn

LHS-8.4=RHS-8.4

k + 8.4 - 8.4 = - 6.3 - 8.4
SubTerm

Subtract term

k = - 14.7
To check that this solution is correct, let's substitute k=- 14.7 into the original equation and simplify.
k + 8.4 = - 6.3
Substitute

k= - 14.7

- 14.7 + 8.4 ? =- 6.3
AddTerms

Add terms

- 6.3 = - 6.3 âś“
Since the left-hand side and right-hand side are equal, k=- 14.7 is the correct solution.
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arrow_right Try It p.128-129
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Try It 2 (Page 128)
Try It 3 (Page 128)
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arrow_right Self-Assessment for Concept & Skills p.129
Self-Assessment for Concept & Skills 5 (Page 129)
Self-Assessment for Concept & Skills 6 (Page 129)
Self-Assessment for Concept & Skills 7 (Page 129)
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arrow_right Self-Assessment for Problem Solving p.130
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arrow_right Review & Refresh p.131
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