Using the accompanying 25. 2x + xy - 1 = 0; 27. x/2 + /2 = a/2. 29. xy = x - y; equation, express each rectangular equation in parametric form. y = t + 2 26. x + y + 3xy = 0; y = tx x = a sin0 28. x(y + 3) = y; 30. y3 2y2 = x; y = sin 0 y (x-1) = x 2 x (y -1) = -4 x = ty y = 1 + 2