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McGraw Hill Integrated II, 2012

MH

McGraw Hill Integrated II, 2012 View details

Practice Test

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Exercise 4 Page 611

Solve for the variable by using cross products.

45

To solve the proportion, we will start by using cross products. Remember that we will need to treat the expressions 5x-4 and 4x+7 as a single quantities in the cross multiplication process.

5x-4/4x+7=13/11

Cross multiply

(5x-4)11=(4x+7)13

From here, we will continue solving for x by using the Distributive Property and the Properties of Equality.

(5x-4)11=(4x+7)13

Distribute 11

55x-44=(4x+7)13

Distribute 13

55x-44=52x+91

LHS+44=RHS+44

55x=52x+135

LHS-52x=RHS-52x

3x=135

.LHS /3.=.RHS /3.

x=45

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