Question

9. x (years since 1991)
2 5 7 8
y (book sales billions $) 18 21 23 24


The table represents the book sales in the U.S in the years after 1991. Write an equation in slope-intercept form to represent the data.

(Points : 1)
y = x + 16
y = 3x + 18
y = 1/6 x + 16
y = 1/3 x + 18


10. What does the slope for this relation represent? x (years since 1991)
2 5 7 8
y (book sales billions $) 18 21 23 24
(Points : 1)

Answer 1

(21 - 18) = 3
(5 -2) = 3
y = x + 16

10) (21 - 18) = 3
(5 - 2) = 3
Therefore the slope is 1, and it represents the rate at which book sales have increased x years since 1991.