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Pearson Algebra 1 Common Core, 2015

PA

Pearson Algebra 1 Common Core, 2015 View details

Chapter Test

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Exercise 1 Page 157

You can solve for the variable by using cross products.

- 20

Practice makes perfect

To solve the proportion, we will start by using cross products. Remember that k≠ 0.

8/k=-12/30

MoveNegFracToNum

Put minus sign in numerator

8/k=- 12/30

Cross multiply

8* 30=k* (- 12)

Multiply

240=- 12k

.LHS /(- 12).=.RHS /(- 12).

- 20=k

Rearrange equation

k=- 20

When k=- 20, the ratios are proportional.

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Exercises p.157