问题
单项选择题
设A，B是x轴上的两点，点P的横坐标为2且|PA|=|PB|，若直线PA的万程为x-y+1=0，则直线PB的方程是( )．
A．( x+y一5=0
B．( 2x-y-1=0
C．( 2y-x-4=0
D．( 2x+y-7=0
答案
参考答案：A,AF,A,AF,B,BD,AF,A,AF,B,B,C,D,A,A,A,B,AF,C,A,B,A,AF,AF,A,9,AC,7,A9,A8,C,B0,BA,BE,A0,A9,7,C,B0,A9,BD,F,C,C,A0,AF,7,A,C,AF,A,AF,B,A,A9,BA,AF,A9,BA,AF,C,A9,BA,AF,A9,BA,AF,B,A9,BA,AF,A9,BA,AF,C,A9,BA,AF,A9,BA,AF,A,B,A,B,B,A,AF,B,AF,B,9,AC,7,A9,A8,C,B0,BA,BE,A0,A9,7,C,B0,A9,BD,D,D,A0,AF,7,BD,BE,A