For x = 1, y = 3, u = -5, v = 6 the point (x+y, u+v) lies in the quadrant .
Abscissa is x + y = 1 + 3 = 4
Ordinate is u + v = -5 + 6 = 1 The point is (4,1).
Since both coordinates of the point are positive ∴ The point lies in quadrant I.
For x = 3, y = 2, u = -9, v = 13 the point (x+y, u+v) lies in which quadrant?
Prove that if then . Will this be true if we use some other numbers instead of 2, 5, 4 and 6?