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Chapter 4: Q63. (page 181)

Use cross products to solve each proportion.

2y=89

Short Answer

Expert verified

Given proportion is simplified to y=94

Step by step solution

01

- Cross product between two proportions

Let ab and cd be two equal proportions that is ab=cd

Then cross product is defined as multiplication of denominator of one proportion with the numerator of other proportion, that is ad=bc

02

- Substitution

Substitute 2 for a, y for b, 8 for c, and 9 for d into ad=bcgives

2脳9=y脳82脳9=y脳8

03

- Simplify 2×9=y×8

To simplify this expression multiply both the numbers of left side and then divide it from number on the right as shown below

18=8yy=188y=94

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