Please go step by step. I don't understand this question. Thank you.
Make a contour map (labeling each level curve) for
2 = a - x - b * P - y = c * P
where a = 20, b = 1, c = 1, Px = 3, and Py = 2. Do vertical cuts of your surface at z = {1, 4, 9, 15}. Your plot window should be between x = {-3, 11} and y = {-5, 7}.