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2(x+y)-3(x-2y)=-7x-2
5(x+1)-2(3-y)=-4(x+y)
2x+2y-3x+6y=-7x-2
5x+5-6+2y=-4-4y
2x+2y-3x+6y+7x=-2
5x+2y+4x+4y=-5+6
6x+8y=-2 /* (-6)
9x+6y=1 /* 8
-36x-48y=12
72x+48y=8
+______________
36x=20/*36
x= 20/36
x=5/9
9x+6y=1
x=5/9
6y=1-9x
x=5/9
6y=1-9*(5/9)
6y=1-5
6y=-4 /6
y=-4/6
y=-2/3
y=-2/3
x=5/9
______________________________________________________
2 równanie:
4(x+2)-3(y-1)=x+y-3
3(x-4)-2(y-2)=4(x-y)+4
4x+8-3y+3=x+y-3
3x-12-2y+4=4x-4y+4
4x-3y-x-y=-3-8-3
3x-2y-4x+4y=4+12-4
3x-4y=-14
-x+2y=12 /*2
3x-4y=-14
-2x+4y=24
+___________
x=10
3x-4y=-14
x=10
-4y=-14-3x
x=10
-4y=-14-3*(10)
x=10
-4y=-14-30
x=10
y=-44/(-4)
x=10
y=11
x=10
Proszę:)