Question

After 4 minutes of reading, Aaron was on page 14 of his book. After 8 minutes he was on page 20. Which equation models the page number, y, in terms of minutes x?
A. y = −8x + 1.5
B. y = 1.5x + 8
C. y = 8x + 1.5
D. y = −1.5x + 8

Answer 1

Find the slope: (20 − 14)/(8 − 4) = 6/4 = 1.5.
Use point-slope: y = 1.5x + b; plug (4,14): 14 = 1.5(4) + b → b = 8.
So y = 1.5x + 8, choice B.