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y﹣4=0 x﹣3=0 y﹣4=2(x﹣3) y﹣4=x﹣3
x+y-2=0 y-1=0 x-y=0 x+3y-4=0
2x﹣y﹣1=0 x﹣2y+3=0 2x+y﹣3=0 x+2y﹣3=0
x+y-2=0 y-1=0 x-y=0 x+3y-4=0
x-3y+7=0 x-3y+13=0 2x-y+7=0 3x-y-5=0
3x-y=0 3x+y=0 x-3y=0 x+3y=0
3x-2y = 0 x + y-5 = 0 2x-3y = 0 或x + y-5 = 0 3x-2y = 0 或x + y-5 = 0
3x+5y+15=0 5x+3y﹣15=0 5x﹣3y+15=0 3x﹣5y﹣15=0
x-3y+7=0 x-3y+13=0 2x-y+7=0 3x-y-5=0
x+y-2=0 y-1=0 x-y=0 x+3y-4=0
2x+y=0 x+y+3=0 x-y+3=0 x+y+3=0或2x+y=0