点P(x,y)在直线4x+3y=0上,且x,y满足-14《=x-y

问题描述:

点P(x,y)在直线4x+3y=0上,且x,y满足-14《=x-y

4x+3y=0
得4x=-3y
可设p点坐标为(3k,-4k)
x-y=7k
则-14