Question

Practice making predictions.
A graph titled Weight Loss Plan has weekly aerobic activity (hours) on the x-axis, and monthly weight loss (pounds) on the y-axis. A trend line goes through points (1.5, 2) and (3.5, 5).

Use the trend line for the data in the scatterplot to make a prediction. About how many pounds were lost per month with 4 hours of weekly aerobic activity?
3 pounds
4.5 pounds
6 pounds
7.5 pounds

Answer 1

Slope = (5−2)/(3.5−1.5) = 3/2 = 1.5, so line: y = 1.5x − 0.25. At x = 4, y = 1.5(4) − 0.25 = 5.75 ≈ 6 pounds. Thus 6 pounds.