50 gallon barrel plumb full of water springs a leak in the bottom and leaks at a constant rate of two gallons per minute.

y=50-2x

slope=-2 what does it represent?
y-intercept=50 what does it represent?
x-intercept=25 what does it represent?

slope is the rate of draining

y-intercept is the amount at full barrel
x-intercept is how long it takes to become empty