Given a graph for the transformation of f(x) in the format GFX equals F of K times X, determine the key value. G(x) f(x) k= -4 K equals -1/4 k equals 1/4 k equals four

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.