This document provides examples of calculating rate of change using the formula M=Y1-Y2/X1-X2. It gives step-by-step workings for finding the rate of change in money over time, gas prices from month to month, bones a dog had over days, and number of friends from month to month. The rate of change was found to be $12.50 per day for money, $0.52 per month for gas prices, -1.33 bones per day, and 7.33 friends per month.

1. Rate Of Change
By Corey Gibson

2. Explaining Rate Of
Change

3. Example 1

4. Example 2

5. Rate of change
• If Jesse has 150 Dollars in his account on
Monday. Wednesday he had 175 Dollars.
what is the increase in money in those 2
days.
M=Y1-Y2/ X1-X2
150.-175./ 0-2
-25/-2= $12.5
per day

6. • Jeremy had 50 dollars when he walked into
the store. He came out of the store an
hour later with 25 dollars. what is the rate
of change.
M=Y1-Y2/ X1-X2
50-25/ 0-60
25/-60=-2.4
-2.40
dollars per
minute

7. • In June gas prices were $2.20. In September
Gas prices were $3.75. What is the rate of
change.
M=Y1-Y2/ X1-X2
$2.20-$3.75/ 6-9
-1.55/ -3=5.17
0.52 dollars per
month

8. • A dog has seven bones on Monday. By
Thursday he only has three what is the rate
of change in the last four days.
M=Y1-Y2/ X1-X2
7-3/ 0-3
4/-3
-1.33
bones
per day

9. • Bobby had 3 friends in September. by
December he had 25 friends. what is the
rate of change.
M=Y1-Y2/ X1-X2
3-25/ 9-12
-22/ -3
7.33 friends per month