SOLUTION: THE COST OF 3 GALLONS OF MILK IS $8.85 AND THE COST OF 5 GALLONS OF MILK IS $14.75. WHAT IS THE RATE OF CHANGE?

Question 1009711: THE COST OF 3 GALLONS OF MILK IS $8.85 AND THE COST OF 5 GALLONS OF MILK IS $14.75. WHAT IS THE RATE OF CHANGE?

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

if the cost of gallons of milk is $, the cost of gallon of milk is $
if the cost of gallons of milk is $, the cost of gallon of milk is $
so, the rate of change is

or, you can find it using given data as two points that lie on same line and find the slope of that line; the slope is actually the rate of change
the points are:
(,)
(,)

so, ones again, the rate of change is

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