已知|x-1|+|y+3|=0,则2x+y=

问题描述:

已知|x-1|+|y+3|=0,则2x+y=

已知|x-1|+|y+3|=0,
x-1=0,y+3=0
x=1,y=-3
则2x+y=2-3=-1