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?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> 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?       Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!

if the cost of 3 gallons of milk is $8.85, the cost of 1 gallon of milk is $8.85%2F3=2.95
if the cost of 5 gallons of milk is $14.75, the cost of 1 gallon of milk is $14.75%2F5=2.95
so, the rate of change is 2.95

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:
(3,8.85)
(5,14.75)
slope=%2814.75-8.85%29%2F%285-3%29
slope=5.9%2F2
slope=2.95
so, ones again, the rate of change is 2.95