Mathss
posted by K .
Item 20
A bathtub is draining at a constant rate. After 2 minutes, it holds 28 gallons of water. Three minutes later, it holds 7 gallons of water. Write an equation that represents the number y of gallons of water in the tub after x minutes.

Mathss 
Steve
we have two data points: (2,28) and (5,7)
so, the slope of the line is (728)/(52) = 7
Using the pointslope form of a line, the function is
y28 = 7(x2)
or
y = 427x
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