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Question
If 12x +13y =29 and 13x +12y=21, find x + y.
Solution
The given equations are
12x+13y=29…(i)
13x+12y=21…(ii)
Add (i) and (ii), we get
12x + 13y =29
13x + 12y =21
-------------------
25x + 25y =50
25(x+y) = 50
x + y = 2
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Linear Equation in Two Variables
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