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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 28 Page 443

Use the Addition Property of Equality to eliminate the subtraction.

x=12.3

Practice makes perfect

To solve the equation, we have to isolate x on one side. Using the Addition Property of Equality, we can add 2.8 to both sides of the equation. This will eliminate subtraction on the left-hand side and isolate x.

x-2.8=9.5

LHS+ 2.8=RHS+ 2.8

x-2.8+ 2.8=9.5+ 2.8

Add terms

x=12.3

To check that this solution is correct, let's substitute x=12.3 into the original equation and simplify.

x-2.8=9.5

x= 12.3

12.3-2.8? =9.5

Subtract term

9.5=9.5 ✓

Because the left-hand side and right-hand side are equal, x=12.3 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