Exercise 30 Page 443

Use the Addition Property of Equality to eliminate the subtraction.

z=5.8

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To solve the equation, we have to isolate z on one side. Using the Addition Property of Equality, we can add 9.4 to both sides of the equation. This will eliminate subtraction on the left-hand side and isolate z.

z-9.4=-3.6

AddEqn

LHS+ 9.4=RHS+ 9.4

z-9.4+ 9.4=-3.6+ 9.4

AddTerms

Add terms

z=5.8

To check that this solution is correct, let's substitute z=5.8 into the original equation and simplify.

z-9.4=-3.6

Substitute

z= 5.8

5.8-9.4? =-3.6

SubTerm

Subtract term

-3.6=-3.6 ✓

Because the left-hand side and right-hand side are equal, z=5.8 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

Exercise 30 Page 443

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