Chapter 8 Review

Front

Solve for x: 4x - 2 = 0

Back

x = 1/2

Front

If y varies directly as x, and y = 22.5 when x = 15, find y when x = 20.

Back

y = 30

Front

A grading machine can grade 48 multiple-choice tests in 1 minute. How long will it take to grade 300 tests?

Back

6.25 Min

Front

The distance that an automobile travels varies directly as the time it travels. If a car travels 280 miles in 7 hours, how far will it travel in 12 hours?

Back

480 miles

Front

Solve for a: 12a - 5 = 107

Back

a = 107/12

Front

Define direct variation.

Back

Direct variation is a relationship between two variables where one variable is a constant multiple of the other.

Front

What is the formula for direct variation?

Back

y = kx, where k is the constant of variation.

Front

If y varies directly as x and k = 3, what is y when x = 4?

Back

y = 12.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together.

Front

If a car travels 60 miles in 1 hour, what is its speed in miles per hour?

Back

60 miles per hour.