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x﹣2y﹣1=0 x﹣2y+1=0 3x﹣2y+1=0 x+2y+3=0
y=﹣x+1 y=﹣x﹣1 y=x+1 y=x﹣1
x+2y-1=0 2x+y-1=0 2x+y-3=0 x+2y-3=0
直线2x+y-2=0 直线2x+y=0 直线2x+y=0或直线2x+y-2=0 直线2x+y=0或直线2x+y+2=0
x+2y-1=0 2x+y-1=0 2x+y-3=0 x+2y-3=0
直线x+y-2=0的左下方 直线x+y-2=0的右上方 直线x+2y-2=0的右上方 直线x+2y-2=0的左下方
2x+y-3=0 2x-y-3=0 2x+y+3=0 2x-y+3=0
x+2y-1=0 2x+y-1=0 2x+y-3=0 x+2y-3=0
2x-y=0 2x-y-2=0 x+2y-3=0 x-2y+3=0
2x–y=0 2x–y–2=0 x+2y–3=0 x+2y–5=0
x+2y-1=0 2 x+y-1=0 2 x+y-3=0 x+2y-3=0
x﹣y+1=0 x+y﹣1=0 x﹣y﹣1=0 x+y+1=0
x,y,z为直线 x,y,z为平面 x,y为直线,z为平面 x为直线,y,z为平面
2x+3y﹣8=0 3x﹣2y+1=0 x+2y﹣5=0 3x+2y﹣7=0
)直线y=0对称 ( )直线x=0对称( )直线y=1对称 ( )直线x=1对称
x+2y-1=0 2x+y-1=0 2x+y-3=0 x+2y-3=0