Variation Functions Quiz

In direct variation, if y = 15 when x = 5, what is the constant of variation?

• 5

• -5

• -3

• 3

If y varies directly as x and y = 9 when x = 3, what is the equation of the variation?

• y = -9x

• y = 3x

• y = -3x

• y = 9x

In joint variation, if y = 12 when x = 3 and z = 8, what is the constant of variation?

• 1/24

• 1/12

• 12

• 24

For joint variation, if y = 25 when x = 10 and z = 5, what is the equation of the variation?

• y = 12xz

• y = 25xz

• y = 10xz

• y = 5xz

In inverse variation, if R = -6 when T = 2, what is the constant of variation?

• 3

• -12

• 12

• -3

If y varies inversely as x and y = 12 when x = 2, what is the equation of the variation?

• y = 6/x

• y = 24/x

• y = 2/x

• y = 12/x

In combined variation, if F varies directly as G and inversely as H, what is the general form of the equation?

• F = k/GH

• F = kH/G

• F = kG/H

• F = kGH

For combined variation, if F = 6 when G = 18 and H = 3, what is the constant of variation?

• 56

• 3

• 6

• 18

In the real-world application, how much larger does the Sun appear on Venus compared to Earth?

• 1.39 times

• 2 times

• 1.2 times

• 1.5 times

If the distance from the Sun affects the apparent size inversely, what happens to the apparent size as the distance increases?

• It remains the same

• It doubles

• It decreases

• It increases