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McGraw Hill Glencoe Algebra 1, 2012 View details

6. Ratios and Proportions

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Exercise 28 Page 115

You can solve for the variable by using the Cross Products Property.

3

Practice makes perfect

To solve the proportion, we will start by using the Cross Products Property. Remember that we need to treat x+9 as a single quantity in the cross multiplication process.

7/x+9=21/36

CrossMult

Cross multiply

7(36)=21(x+9)

Multiply

252=21(x+9)

Now, we can continue solving using the Distributive Property and the Properties of Equality.

252=21(x+9)

Distr

Distribute 21

252=21x+189

SubEqn