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

Given:
y is the amount of change from a $10 bill.
x is the number of bagels bought

Given coordinate is (4,7). Bought 4 bagels and had a change of $7.

10 - 7 = 3 cost of the bagels
3 / 4 = 0.75 cost of each bagel.

The function should be: 

f(x) = -0.75x + 10

Where 0.75 is the cost per bagel bought, x is the number of bagels bought, $10 is the cash paid for the bagels and f(x) is the amount of change received from the purchase of bagels.