You are using an inflatable ball that has an inner sphere filled with water. The sphere that contains the water has a radius of 3 inches and the entire
inflatable ball has a radius of 9 inches. What is the volume that the air takes
up?

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

they can both be solutions depends on the equation

step-by-step explanation:

what is the equation? ?