Question

In 2011, a collector of sports memorabilia purchased specific baseball cards as an investment. Let y represent each card’s resale value (in dollars) and x represent the number of years since purchase. Each of the cards’ resale values after 0, 1, 2, 3, and 4 years could be modeled by linear functions as follows:

Card A: y=3−0.8x ,Card B: y=7+2.7x ,Card C: y=15+0.9x ,Card D: y=14−3.1x ,Card E: y=5+0.25x

Select ALL cards that are decreasing in value.

Question 3 options:

a)

Card E: y=5+0.25x

b)

Card D: y=14−3.1x

c)

Card B: y=7+2.7x

d)

Card C: y=15+0.9x

e)

Card A: y=3−0.8x
more than one answer.

Answer 1

y=mx+b
if m is negative then it is decreaseing


answer is cards A and D