Write a rule for the linear function in the graph.
a. y = -4x + 13
b. y = -4x – 13
c. y = 4x – 13
d. y = 1/4x – 13

Suppose that the price p, in dollars, and the number of sales, x, of a certain item follow the equation 4 p plus 4 x plus 2 pxequals56. suppose also that p and x are both functions of time, measured in days. find the rate at which x is changing when xequals2, pequals6, and startfraction dp over dt endfraction equals1.5.