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Maths Exercices

Rate of change

A rate of change is a rate that describes how one quantity changes in relation to another.

FIND RATE OF CHANGE FROM A TABLE
John used a table to record his earnings at his new job. Use the information to find the rate of change in dollars per hour.

Time (h)
Wages ($)
0
0
1
9
2
18
3
27

Find the unit rate to determine the rate of change.

change in money
____________________________________
change in hours
 = 
9
_______________________________
1

We have the unit rate. So the rate of change is 9$ per hour.


FIND RATE OF CHANGE FROM A GRAPH

The graph shows the cost of T-Shirts for a spirit sale. What is the rate of change, in dollars per shirt, according to the graph?  

To find the rate of change, pick any two points on the line, such as (1, 9) and (2, 18).

The rate of change is 9$ per shirt.