Y = 1/3 what is the value of y?

The table respent two linear functions the equation respented by the first tables is given

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

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.