Step 1. Equation B could not have simplified out to 3y= 3 - 4z because Equation A's original equation was y= 15 - 2z. That means after the multiplication by -3, -3(y)= -3(15 - 2z) it would equal -3y= -45 + 6z.
Answer:
or 
Step-by-step explanation:
we know that
The surface area of a cube is equal to

where
x is the length side of a cube
In this problem we have

substitute in the formula and solve for x


square root both sides
