Using substitutional method, solve the problem.

x= 4y
2x-y=-1

The surface area (sa) of a cube with a as the length of each of its sides is given by the formula . if the surface area is known, how can you rewrite the formula to find its side?

Diana is painting statues she has 7/8 of a liter of paint each statue requires 1/20 of a liter of paint how many statues can she paint?

This question awards 100 ! i really don’t want to fail i will also mark you !