A rectangular swimming pool has a volume of 2160 cubic feet. Water is being added to pool at a rate of about 20 cubic feet per minute. Use an equation in point-slope form to determine about how long it will take to fill the pool completely if there were already about 1200 gallons of water in the pool. Use the fact that 1 cubic foot of space holds about 7.5 gallons of water.
1200÷7.5= 160 -> there is already 160 cubic ft. of water y=20x+160 -> this is the equation 2160=20x+160 2000=20x 100=x you need 100 cubic ft. more to finish filling the pool
