Решите систему х-у=3 2х+2у=4

[latex] left { {{x-y=3} atop {2(x+y)=4}} ight.left { {{x=y+3} atop {y+3+y=2}} ight. left { {{x=y+3} atop {2y=-1}} ight. left { {{x=y+3} atop {y=-frac{1}{2} }} ight.left { {{x=y+3} atop {y= -frac{1}{2} }} ight. left { {{x=3- frac{1}{2} } atop {y=- frac{1}{2} }} ight. left { {{x= frac{5}{2} } atop {y=- frac{1}{2} }} ight. [/latex]

X=3+y2(3+y)+2y=46+2y+2y=42=-4yy=-0,5