Question

kelsey purchases a coupon book with discounts for her favorite coffee shop: every coupon for the coffee shop offers the same discount. The table shows her total savings, y, based on the number of coupons, x, used from the book. what are the slope and Y intercept of the line represented by the points shown in the table?

Answer 1

9514 1404 393

Answer:

b. slope: 2; y-intercept: -20

Explanation:

The y-intercept is the first point in the table, where x=0. That eliminates choices A and D.

The slope is the difference in y divided by the difference in x. Using the first and second points in the table, this is ...

(-10 -(-20))/(5 -0) = 10/5 = 2

The slope is 2; the y-intercept is -20.