Without finding the value of x and y find the value of (x + y) and (x−y)for the following equations. i) 12x + 13y = 51; 13x + 12y = 49
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I think the second equation is 13x+12y=21
12x+13y=29 (eq. i) (eq. ii)
13x+12y=21
(i)+(ii)
25x+25y=50
25(x+y)=50
x+y=50/2 x+y=2 (Ans.)
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