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Math·Algebra·Linear equations in two variables

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The amount of water $y$, in gallons, in a reservoir $x$ minutes after the reservoir begins to drain using a pump is given by the equation $y=7,200-8x$. If the equation is graphed in the $xy$-plane, which of the following is the best interpretation of the $x$-intercept?

A

There are 900 gallons of water in the reservoir before it begins to drain.

B

The reservoir drains at a rate of 8 gallons per minute.

C

There are 7,200 gallons of water in the reservoir before it begins to drain.

D

The water will completely drain from the reservoir 900 minutes after the reservoir begins to drain.