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y=3x-2
y=4
4=3x-2
6=3x/:3
x=2
2.
2x=2(y-1)+x
4x-2=5-y
2x=2y-2+x
y=7-4x
2x=2(7-4x)-2+x
y=7-4x
2x=14-8x-2+x
y=7-4x
9x=12/:9
y=7-4x
x=1⅓
y=7-4x
x=1⅓
y=7-4×1⅓
x=1⅓
y=7-5⅓
x=1⅓
y=1⅔
3.
3-x : 2+y + ⅔ = 1
3x=2y-4
-x=1-3×2+y-⅔/×(-1)
3x=2y-4
x=-1+6-y+⅔
3x=2y-4
x=5⅔-y
3(5⅔-y)=2y-4
x=5⅔-y
17-3y=2y-4
x=5⅔-y
21=5y/:5
x=5⅔-y
y=4⅕
x=5⅔-4⅕
y=4⅕
x=2:15≈0,133
y=4⅕
Nie wiem czy to ostatnie jest dobrze.