A2 8.1-8.3

Which is the direct variation equation?

• y=kx

• y=k/x

• y=kxz

• x=ky

Which is the inverse variation equation?

• y=kx

• y=k/x

• y=kxz

• x=ky

Which is the joint variation equation?

• y=kx

• y=k/x

• y=kxz

• x=ky

The table shown represents...

• Direct Variation

• Inverse Variation

• Joint Variation

• Neither

The table shown represents...

• Direct Variation

• Inverse Variation

• Joint Variation

• Neither

Suppose that x and y vary inversely and that x=2 when y=8. Write the function that models the inverse variation.

• y=4/x

• y=4x

• y=16/x

• y=16x

Suppose that x and y vary inversely and that x=5 when y=10. Write the function that models the inverse variation.

• y=50x

• y=50/x

• y=2x

• y=2/x

Suppose that x and y vary inversely. If x=2 when y=8, then find y when x=4.

• y=16

• y=1

• y=4

• y=2

Write the function that models the variation:

r varies jointly with s and u and inversely with t.

Write the function that models the variation:

y varies jointly with x and z and inversely with the cube of t.