Posted by Barney on Sunday, July 24, 2011 at 8:32pm.
1st one by 30 ----> 9x - 6y = 120
2nd by 20 -------> 8x +6y = 980/23
add them
17x = 3740/23
x = 220/23
back into 8x + 6y = 980/23
1760/23 + 6y = 980/23
6y = -780/23
y = -130/23
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