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Glencoe Math: Course 2, Volume 2

GM

Glencoe Math: Course 2, Volume 2 View details

1. Solve One-Step Addition and Subtraction Equations

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Exercise 29 Page 443

Use the Addition Property of Equality to eliminate the subtraction.

r=6.4

Practice makes perfect

To solve the equation, we have to isolate r on one side. Using the Addition Property of Equality, we can add 8.5 to both sides of the equation. This will eliminate subtraction on the left-hand side and isolate r.

r-8.5=-2.1

LHS+ 8.5=RHS+ 8.5

r-8.5+ 8.5=-2.1+ 8.5

Add terms

r=6.4

To check that this solution is correct, let's substitute r=6.4 into the original equation and simplify.

r-8.5=-2.1

r= 6.4

6.4-8.5? =-2.1

Subtract term

-2.1=-2.1 ✓

Because the left-hand side and right-hand side are equal, r=6.4 is the correct solution.

Subchapter links

Guided Practice p.440

Independent Practice p.441-442

H.O.T. Problems p.442

Standardized Test Practice p.442-444

Extra Practice p.443

Common Core Review p.444