Solve x and y
37x+43y=123
43x+37y=117
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37 x + 43 y = 123 ----(1)
43 x + 37 y = 177 --- (2)
(1) - (2) : - 6 x + 6 y = - 54
=> x - y = 9 --- (3)
(1) + (2) : 80 x + 80 y = 300
=> x + y = 15/4 -- (4)
add (3) and (4): 2 x = 9 + 15/4 = 51/4
=> x = 51/8
=> y = x - 9 = -21/8
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