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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 25 Page 443

Use the Addition Property of Equality to eliminate the subtraction.

a=18.4

Practice makes perfect

To solve the equation, we have to isolate a on one side. Using the Addition Property of Equality, we can add 3.5 to both sides of the equation. This will eliminate subtraction on the left-hand side and isolate a.

a-3.5=14.9

LHS+ 3.5=RHS+ 3.5

a-3.5+ 3.5=14.9+ 3.5

Add terms

a=18.4

To check that this solution is correct, let's substitute a=18.4 into the original equation and simplify.

a-3.5=14.9

a= 18.4

18.4-3.5? =14.9

Subtract term

14.9=14.9 ✓

Because the left-hand side and right-hand side are equal, a=18.4 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