at age 16, estelle weighed 110lbs.
by age 21 she weighed 128lbs.
what is the increase in her weight over the past 5 years?
x= age
y= weight
slope= y2-y1/x2-x1

Her weight is increase by 18 lbs over past five years and the slope is 3.6 lbs per year.

Step-by-step explanation:

Given information: Estelle weight is

At age 16 =  110 lbs

At age 21 = 128 ibs

Increase in her weight over the past 5 years is the difference of weight at age 21 and at age 16.

Increase in her weight over the past 5 years = 128 - 110 = 18

Her weight is increase by 18 lbs over past five years.

Let x=age and y=weight, then the weight function passes through the points (16,110) and (21,128).

If a line passes through two points and ,  then the slope of the line is

Using the above formula we get

Therefore the slope is 3.6 lbs per year.

d) -1

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