 Hong Kong
Stage 4 - Stage 5

# Direct and Inverse Variation

## Interactive practice questions

Suppose the constant of variation $k$k is positive.

a

If $y$y varies directly as $x$x, which of the following is true?

When $x$x increases, $y$y increases. When $x$x decreases, $y$y decreases.

A

When $x$x increases, $y$y decreases. When $x$x decreases, $y$y decreases.

B

When $x$x increases, $y$y increases. When $x$x decreases, $y$y increases.

C

When $x$x increases, $y$y decreases. When $x$x decreases, $y$y increases.

D
b

If $y$y varies inversely as $x$x, which of the following is true?

When $x$x increases, $y$y decreases. When $x$x decreases, $y$y increases.

A

When $x$x increases, $y$y increases. When $x$x decreases, $y$y decreases.

B

When $x$x increases, $y$y decreases. When $x$x decreases, $y$y decreases.

C

When $x$x increases, $y$y increases. When $x$x decreases, $y$y increases.

D
Easy
Approx a minute

Does the equation $y=5x$y=5x represent direct or inverse variation?

Does the equation $y=\frac{5}{x}$y=5x represent direct or inverse variation?

The period of a pendulum varies directly with the square root of its length.

If the length is quadrupled, what happens to the period?