2x+3y=2,4x-9y=-1,
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2x+3y=2,4x-9y=-1,2x+3y=2,4x-9y=-1,2x+3y=2,4x-9y=-1,1式乘以2减去2式,得y等于1/3然后算的x等于1/2
2x+3y=2,4x-9y=-1,
2x+3y=2,4x-9y=-1,
2x+3y=2,4x-9y=-1,
1式乘以2减去2式,得y等于1/3 然后算的x等于1/2
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