Graph the line with slope 1/3 and y-intercept -9

Suppose that the price p (in dollars) and the weekly sales x (in thousands of units) of a certain commodity satisfy the demand equation 4p cubedplusx squaredequals38 comma 400. determine the rate at which sales are changing at a time when xequals80, pequals20, and the price is falling at the rate of $.20 per week.

Whats the name of the vertical axis

On a piece of paper, graph y< x+1. then determine which answer matches the graph you drew.