- Rate of change formula: [tex] \frac{y_2-y_1}{x_2-x_1} [/tex]
65.
[tex] \frac{540-135}{12-3}=\frac{405}{9}=45 [/tex]
The rate of change is 45 miles per hour.
66.
[tex] \frac{161-173}{7-1}=\frac{-12}{6}=-2 [/tex]
The rate of change is -2 pounds per week.
