Write an equation for each statement. Then, solve the equation.


9) If y varies inversely as x and y=2 when x=8, find x when y = 14.

10) Suppose y varies jointly with x and z. If y = 20 when x=2 and z = 5, find y when x = 14 and z = 8.

11) If y varies inversely as x and x=7 when y=21, find y when x = 42.

12) Find y when x=1.5, if y varies directly as x and y=-16 when x = 6.​