If the volume of a cube is increasing at 24 and the surface area of the cube is increasing at 12, what is the length of each edge of the cube?

The length of each edge of the cube is 8 units.            

Step-by-step explanation:

We are given the following in the question:

Let V be the volume of cube, S be the surface area of cube and l be the edge of cube.

We have to find  the length of each edge of the cube.

Volume of cube =

Surface area of cube =

Dividing the two equations, we have:

The length of each edge of the cube is 8 units.          

b.an increase in a causes b to decrease

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