Proportional or Non-Proportional

Explain Why or why not?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Using elimination, what is -4x+2y=-12 4x+8y=-24

Louis wants to give \$15 to kids who need school supplies. he also wants to buy a pair of shoes for \$39. how much money will he have to save for both?