algebra
posted by cats  Please help .
you pull out the plug from the bathtub. after 30 seconds, there are 14 gallons of water left in the tub. one minute after you pull the plug, there are 9 gallons left.
how many gallons of water were in the tub initially, that is before the plug was pulled?
how many gallons of water were still in the tub 45 seconds after the plug was pulled.

We had a very similar question yesterday
https://www.jiskha.com/display.cgi?id=1512043982
In that one, I had found the slope
Using (30,14) as a point, find the equation in the form
y = mx + b
then sub in 45 for x to get the number of gallons
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