Answer it, it is tricky

Question

A kid's pool had 50 gallons of water initially. A hose is used to fill the pool at the rate of 25 gallons per

minute. Jane plots the graph of this situation in the coordinate plane with y representing the volume of

water in gallons and z representing the time in minutes required to fill it.

Which of the following points will lie on the graph?

Answer 1

50 = initial volume

at time z, measured in minutes, volume =

y = 50+25z

is a straight line graph with points such as

(z,y) = (0,50), (1,75), (2, 100), (3,125), ....