Choose all of the tables that represent a proportional relationship

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.

100 points, hi, i’m not sure how to get the equation from the graph and table.

If y varies directly as x2 and y=6 when x=6, find the constant of variation.