2x+3y-17=0 3x+7y-12=0 solve by cross multiplication
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2x+3y-17=0
3x+7y-12=0
2x+3y=17
3x+7y=12
We know pattern of cross multiplication
b1 c1 a1 b1
× × ×
b2 c2 a2 b2
3 17 2 3
×. × ×
7 12 3 7
=
=
a÷36-119 = b÷51-24 = -1 ÷ 21 - 9
a÷ -83 = b÷27 = -1÷12
a÷ -83=-1÷12 b÷27 = -1÷12
a = 6.91 b = 2.25
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