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10x-2+3y=15x+5y+2
6x+4y=20
10x+3y-15x-5y=4
6x+4y=20
-5x-2y=4 | *2
6x+4y=20
-10x-4y=8
_________
-4x=28 | /-4
x=-7
6*(-7)+4y=20
-42+4y=20
4y=20+42
4y=62 | /4
y=15.5
x=-7
y=15.5
3(2x-1)+4(y-2)=9
2(5x-1)+3y=5(3x+y)+2
6x-3+4y-8=9
10x-2+3y=15x+5y+2
6x+4y=20
10x+3y-15x-5y=4
6x+4y=20
-5x-2y=4 /razy2
dodajemy stronami
6x+4y=20
-10x-4y=8
--------------------
-4x=28 /:(-4)
x=-7
6*(-7)+4y=20
-42+4y=20
4y=20+42
4y=62 | /4
y=15.5
x=-7
y=15.5
10x-2+3y=15x+5y+2
6x+4y=20
10x+3y-15x-5y=4
6x+4y=20
-5x-2y=4 | *2
6x+4y=20
-10x-4y=8
_________
-4x=28 | /-4
x=-7
6*(-7)+4y=20
-42+4y=20
4y=20+42
4y=62 | /4
y=15.5
x=-7
y=15.5