Unit 7 Review

Front

What is the equation for inverse variation?

Back

r = k/t, where r is the speed, k is a constant, and t is the time.

Front

If x and y vary inversely, how can you express y in terms of x if x = 6 when y = 2?

Back

y = 12 / x.

Front

What is the relationship between lightning distance and time counted until thunder is heard?

Back

y = 5x, where y is the distance in miles and x is the time in seconds.

Front

If x increases in a direct variation, what happens to z?

Back

z increases.

Front

What type of variation is represented when y increases as x increases?

Back

Direct variation.

Front

What is direct variation?

Back

A relationship where one variable is a constant multiple of another, expressed as y = kx.

Front

What is inverse variation?

Back

A relationship where one variable increases as the other decreases, expressed as y = k/x.

Front

If y = 3/x, what happens to y as x increases?

Back

y decreases.

Front

In the equation y = k/x, what does k represent?

Back

k is a constant that represents the product of x and y.

Front

How do you find the constant of variation in direct variation?

Back

By dividing y by x (k = y/x).