到西坐标轴的距离相等
所以|A-2|=|3A-3|
A-2=±(3A-3)
A-2=-(3A-3)
A-2=-3A+3
A=5/4
A-2=-3/4,3A-3=3/4
A-2=3A-3
A=1/2
A-2=3A-3=-3/2
所以P(-3/4,3/4),(-3/2,-3/2)