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Pearson Algebra 1 Common Core, 2011
PA
Pearson Algebra 1 Common Core, 2011 View details
Chapter Review
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Exercise 44 Page 155

You can solve for the variable by using cross products.

21

Practice makes perfect

To solve the proportion, we will start by using cross products.

3/7=9/x
CrossMult

Cross multiply

3* x=7* 9
Multiply

Multiply

3x=63
DivEqn

.LHS /3.=.RHS /3.

3x/3=63/3
CalcQuot

Calculate quotient

x=21

When x=21, the ratios are proportional.

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arrow_right Exercises p.152-156
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Exercises 7 (Page 153)
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