What is the slope of the line?

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.

Is (0,0) a to ? ys x2 - 4 y> 2x-1

What are the intercepts of x^2+y-9=0