1)5x-2y=9x+2y=3
x=3-2y
5(3-2y)-2y=9
15-10y-2y=9
-12y=-6
y=1\6
x=3-2*1\6=8\3
ответ:(8\3;1\6)
2)x+y=-5
x-y=-7
x=-y-5
-y-5-y=-7
-2y=-2
y=1
x=-1-5=-6
1)5x-2y=9
x+2y=3
x=3-2y
5(3-2y)-2y=9
15-10y-2y=9
-12y=-6
y=1\6
x=3-2*1\6=8\3
ответ:(8\3;1\6)
2)x+y=-5
x-y=-7
x=-y-5
-y-5-y=-7
-2y=-2
y=1
x=-1-5=-6