43.) one of the points which lie on the solution cu of the differential equation (y-x) dx +(t +y) dy = 0, (a) (1, - 2) (b) (2,- 1) (c) (2, 1) (d)(-1, 2)

43.) One of the points which lie on the solution cu of the differential equation (y-x) dx +(t +y) dy = 0, (a) (1, - 2) (b) (2,- 1) (c) (2, 1) (d)(-1, 2)