4x1+y1+6=0
3x2-5y2-6=0
截得的线段的中点恰好是坐标原点
x1=-x2
y1=-y2
4x1+y1+6=0
-3x1+5y1-6=0
20x1+5y1+30=0
-3x1+5y1-6=0
x1=36/23
y1=246/23
(36/23,246/23)
y=kx
k=(41/6)x
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