Select the equation below that is parallel to the line with the equation y = 3x + 2 and goes through the point (3,6).
y - 3x - 3
y = -1/3x+5
y=-1/3x - 7
y - 3x - 9

Me because some of question i don’t understand

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.

Solve for x and select the correct answer