Решите систему уравнений любым способом:
1) 3х+2у=-2
у+х=-1
2) х-у=5
2х+у=1
3) х+у=5
2х+у=1
4) х+у=3
2х+3у=3
5) 2х-у=8
х-у=5
1) 3х+2у=-2
у+х=-1
2) х-у=5
2х+у=1
3) х+у=5
2х+у=1
4) х+у=3
2х+3у=3
5) 2х-у=8
х-у=5
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Answers & Comments
у+х=-1
3x+2y=-2
x=-1-y
3(-1-y)+2y=-2
x=-1-y
-3-3y+2y=-2
x=-1-y
-3y+2y=3-2
x=-1-y
-y=1
x=-1-y
y=1
x=-1-(-1)
y=1
x=0
2) х-у=5
2х+у=1
x=5+y
2х+у=1
x=5+y
2(5+y)+y=1
x=5+y
10+2y+y=1
x=5+y
2y+y=1-10
x=5+y
3y=-9
x=5+y
y=-9/3
x=5+y
y=-3
x=5+(-3)
y=-3
x=2
y=-3
2х+у=1
4) х+у=3
2х+3у=3
5) 2х-у=8
х-у=5