please help with 1 algebra question, i to know for my quiz!?

musiclover1009

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A pump removes water from a pool at a constant rate of 50 gal/min. After 6 minutes there were 700 gallons water remaining the pool.

a) write a linear model for the amount of water (y) in pool after (t) minutes
b) when will the pool be empty?

I really need help with b! I have no clue how to do that. Please help. I will greatly appreciate it.
 
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