Question

The graph shows the relationship between the amount of change given from a $10 bill and the number of bagels purchased.



A graph shows number of bagels labeled 1 to 10 on the horizontal axis and change given (dollar sign) on the vertical axis. A line decreases from 0 to 10.

What function represents the amount of change given from a $10 bill, f(x), based on x, the number of bagels purchased?

f(x) = + 10
f(x) = + 10
f(x) = + 10
f(x) = + 10

Answer 1

f(x) = 10 − x

Reason: each bagel costs \$1, so change = \$10 − (\$1 × number of bagels). Check: f(0)=10, f(10)=0.