若2X-3Y+4Z=2,4X+3Y+2Z=4,则X+Y=多少

问题描述:

若2X-3Y+4Z=2,4X+3Y+2Z=4,则X+Y=多少

X=0,Y=2/3,Z=1先解得X+Z=1,4X+9Y=6,9Y-6Z=0