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x﹣2y+7=0 2x+y﹣1=0 x﹣2y﹣5=0 2x+y﹣5=0
x2=-y或y2=x y2=-x或x2=y y2=-x x2=y
2x﹣y﹣1=0 x﹣2y+3=0 2x+y﹣3=0 x+2y﹣3=0
y=x-2 y=x+2 y=2x+1 y=-2x+1
x+2y-5=0 x+2y+5=0 2x-y=0或x+2y-5=0 2x-y=0或x-2y+3=0
2x+y-12=0 2x+y-12=0或2x-5y=0 x-2y-1=0 x+2y-9=0或2x-5y=0
x-2y-5=0 x-2y+7=0 2x+y-1=0 2x+y-5=0
y=x2﹣1 y=(x+1)2 y=x2+x y=x2﹣x﹣1
x-2y-1=0 x-2y+1=0 2x+y-2=0 x+2y-1=0
x-2y-1=0 x-2y+1=0 2x+y-2=0 x+2y-1=0
x-y-2=0或5x+4y-1=0 x-y-2=0 x-y+2=0 x-y-2=0或4x+5y+1=0
(1,2)且垂直于直线2x+y﹣5=0的直线方程为( ) A.x﹣2y+4=0 2x+y﹣7=0 x﹣2y+3=0 x﹣2y+5=0
(2,3)且垂直于直线2x+y-5=0的直线方程为( ). A.x-2y+4=0 2x+y-7=0 x-2y+3=0 x-2y+5=0
2x+y-1=0 2x+y-5=0 x+2y-5=0 x-2y+7=0
x-2y-2=0 x-2y+2=0 x+2y-2=0 x+2y+2=0
x-2y-1=0 x-2y+1=0 2x+y-2=0 x+2y-1=0