Question

A tire company wants to know how quickly the tread on its tires wears down with average use. Have x represent the number of months the tire was used and have y represent the thickness of the tire tread, in millimeters. The equation for the line of best fit is:
y = -3/7x +20

Answer 1

1. What is the slope? ________________ What does it represent? _________________________ 2. What is the y-intercept? ___________ What does it represent? _________________________ Lauryn was told after 21 months, she will need to replace the tires because the tread will be too thin.
3. After 20 months, how many millimeters this will her tire tread be? __________________________ 4. After 49 months, how much tire tread is left? ________ What does that mean?______________

Answer 2

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