How to know whether two quantities x and y are proportinal?

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

2y= 3 2 x−2 y = − 1 3 x + 1 y=− 3 1 x+1

1. a parachutist is 800 feet above the ground when she opens her parachute. she then falls at a constant rate of 5 feet per second. select the equation that represents this situation. h = -800t + 5 y = -5x + 800 h = 5t - 800 y = 800x + 5 i need