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Zad4
3-2x+2y=y-x+4
y-2x=2
y-3x=1 /*(-1)
-y+3x=-1
x=1
y-2=2
y=4
Zad5
6(7x-3y)=10(5x-y)-15(x+y)
3x-3=5y+5
42x-18y=50x-10y-15x-15y
3x-5y=8
7x+7y=0
x+y=0 /*(-3)
-3x-3y=0
-8y=8
y=-1
Zad6
2x+2y-x+y=-4
x+y=2 /*(-1)
x+3y=-4
-x-y=-2
2y=-6
y=-3
-x+3=-2
-x=-5
x=5
Zad7
6-2x+4y=6-3y+1
2x-3y=5
-2x+7y=1
4y=-4
2x+3=5
Zad8
3x+12+2y-8=3
-2y-2x=0
3x+2y=-1
3+2y=-1
2y=-4
y=-2
Zad9
x²-6x+9-y²+2y-1=x²-4x-y²+4
x+2y=5
-2x+2y=-4
x+2y=5 /*2
2x+4y=10
6y=6
y=1
-2x+2=-4
-2x=-6
x=3
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Zad4
3-2x+2y=y-x+4
y-2x=2
y-3x=1 /*(-1)
y-2x=2
-y+3x=-1
y-2x=2
x=1
y-2=2
y=4
Zad5
6(7x-3y)=10(5x-y)-15(x+y)
3x-3=5y+5
42x-18y=50x-10y-15x-15y
3x-5y=8
7x+7y=0
3x-5y=8
x+y=0 /*(-3)
3x-5y=8
-3x-3y=0
3x-5y=8
-8y=8
y=-1
x=1
Zad6
2x+2y-x+y=-4
x+y=2 /*(-1)
x+3y=-4
-x-y=-2
2y=-6
y=-3
-x+3=-2
-x=-5
x=5
Zad7
6-2x+4y=6-3y+1
2x-3y=5
-2x+7y=1
2x-3y=5
4y=-4
y=-1
2x+3=5
x=1
Zad8
3x+12+2y-8=3
-2y-2x=0
3x+2y=-1
-2y-2x=0
x=1
3+2y=-1
2y=-4
y=-2
Zad9
x²-6x+9-y²+2y-1=x²-4x-y²+4
x+2y=5
-2x+2y=-4
x+2y=5 /*2
-2x+2y=-4
2x+4y=10
6y=6
y=1
-2x+2=-4
-2x=-6
x=3