A shoe store sells 23 pairs of shoes per day at $130 per pair and 20 pairs of shoes per day at $136 per pair. Assume that the number of pairs of shoes sold each day depends on the price of the shoes.

a) Find a linear function equation for the number of pairs of shoes sold per day.
b) Use the function found in part a) to predict the number of pairs of shoes sold per day at $140 per pair.

A) What is the linear function equation for the number of pairs of shoes sold per day?
a) f(x) = 53x - 686
b) f(x) = 53x + 686
c) f(x) = -53x + 686
d) f(x) = -53x - 686