Question

A bathtub is draining at a constant rate. After 2 minutes, it holds 30 gallons of water. Three minutes later, it holds 12 gallons of water. Write an equation that represents the number y of gallons of water in the tub after x minutes.

Answer 1

3 minutes - 2 minutes = 1 minute

30 gallons - 12 gallons = 18 gallons

it is draining at 18 gallons per minute

equation would be: y = -18x