Solve the following equation for x

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

Construct the graph that models the given situation

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.