Question 866853
The description gives two ordered pair, and the rate of change between them is assumed as a constant.  If (x,y) represents time since pull of plug and gallons of water in the tank, in that order, then your two points are (40,13) and (60,10).  Find the line which contains these two points.


Using slope intercept form and the point (60,10),
b=y-mx;
{{{b=10-((13-10)/(40-60))60=10-(-3/20)60=10+3*3=19}}}
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{{{highlight(y=-(3/20)x+19)}}}
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This bathtub hold 19 gallons as capacity.