Question

A teacher weighed 145 lbs in 1986 and weighs 190 lbs in 2007. What is the rate of change in pounds per year?

Answer 1

`color(brown)("Rate of change in pounds per year " m = 15/7 "or " 2.14`

Explanation:

`(x_1, y_1) = 1986, 145), (x_2,y_2) = (2007, 190)`

`"Rate of change in pounds per year " m = (y_2-y_1) / (x_2-x_1)`

`=> (190 - 145) / (2007 - 1986) = 45 / 21 = 15/7 " or " 2.14`

graph{(15/7) x [-10, 10, -5, 5]}