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x+1=y-x
x+y=7
2x-y=-1
_______
3x=6
x=2
x+2=7
x=5
x=5
y=2
b)1/2x+1/3y=18 /*6
1/2x=2/3y /*6
3x+2y=108
3x-4y=0 /*(-1)
3x+2y=108
-3x+4y=0
___________
6y=108
y=18
3x+2*18=108
3x+36=108
3x=72
x=24
x=24
y=18
c) x+y=150
1/3x+2/7y=46 /*21
x+y=150 /*(-7)
7x+6y=966
-7x-7y=-1050
7x+6y=966
_________
-y=-84
y=84
x+84=150
x=66
x=66
y=84
d) x-150=y+150
y=1/4x /*4
x-y=300
-x+y=0
_______
0=300
sprzeczne
e) x+y=45
x=y+25
f) x-1=2*(y-1)
x=y+5
x-1=2y-2
x-y=5
x-2y=-1
x-y=5 /*(-1)
x-2y=-1
-x+y=-5
_______
3y=-6
y=-2
-x-2=-5
-x=-3
x=3
x=3
y=-2
g) x-y=50
x+y+90=180
x-y=50
x+y=90
________
2x=140
x=70
70+y=90
y=20
x=70
y=20