5. (5pts) If f is a function of x and y, each of which are functions of t, such that the following information is true, determine at le=7 y(5) - 2 x(5) = 1 y'(5) = 17 x'(5) = 81 fx(8, 7) = 3 fy(8, 7) = -17 y (7) = 7 2(7) = 8 y'(7) = 12 x'(7) =-11 fx(8, 2) = -1 fy(8, 2) = -11 y(0) = 0 x(0) = 3 y'(0) = 30 x'(0) = -30 fx(3, 0) = -2 fy(3, 0) = 0