1/5x + 1/6y = 12 and 1/3x - 3/7x = 8
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1/3 x - 3/7 x = 8 ........... eq 1
1/5 x + 1/6 y = 12 .......... eq 2
(7x - 9x)/21 = 8
7x - 9x = 168
-2x = 168
x = -84
put value of x in eq 1
(1/5 × -84) + 1/6 y = 12
(-84/5) + 1/6 y = 12
( -504 + 5y)/30 = 12
5y = 864
y = 172.8
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