Combined and Joint Variation

z varies _____ with y

• inversely

• directly

• indirectly

z varies _____ with b

• inversely

• directly

• indirectly

This is an example of ______

• joint variation

• combined variation

• neither

This is an example of ______

• direct variation

• inverse variation

• neither

If x increases, then z _______

• increases

• decreases

• stays the same

This is an example of _______

• Direct Variation

• Inverse Variation

• Join Variation

• Combined Variation

t varies ____ with r

• Directly

• Inversely

• Indirectly

Suppose y varies directly as x, and y=39 when x=3.  Find the value of y when x=2.

• 26
• 3
• 58.5
• 2

Suppose y varies jointly as x & z. 
If y = -180 when z = 15
and x = -3,
then find y when x = 7 and z = -5.

• -140
• 140
• -4
• 4

Suppose a varies jointly as b & c. 
If a = 15 when b = 4
and c = 5,
then find b when a = 60 and c = 5.

• 320
• 225
• 16
• 8