x+y=3 x-y=3 how to solve this equation using completing the square method Share with your friends Share 0 Priyanka Kedia answered this Note:The given equations are linear equations. So,we can't use completing the square method. We can use this method only in quadratic equation.Now,x+y=3 .....1x-y=3 ......2Adding equation 1 and 2,2x=6⇒x=3Substitute x=3 in equation 1, we get,3+y=3⇒y=0Hence, x=3 and y=0. 0 View Full Answer