Question

решите систему
х-у=3
2х+2у=4

Answer 1

$left { {{x-y=3} atop {2(x+y)=4}} right. left { {{x=y+3} atop {y+3+y=2}} right. left { {{x=y+3} atop {2y=-1}} right. left { {{x=y+3} atop {y=-frac{1}{2} }} right. left { {{x=y+3} atop {y= -frac{1}{2} }} right. left { {{x=3- frac{1}{2} } atop {y=- frac{1}{2} }} right. left { {{x= frac{5}{2} } atop {y=- frac{1}{2} }} right.$

Answer 2

ничего не понятно

Answer 3

с какого момента?

Answer 4

все спасибо)

Answer 5

X=3+y
2(3+y)+2y=4
6+2y+2y=4
2=-4y
y=-0,5