Rozwiąż układy równań :
a)4x+y=11
5y-x=13
b)2x-2y=5
2x+y=7
c)5x-y=7
2(x+1)=2y
c)
5x-y=7
2x+2=2y
2x-2y=-2/: (-2)
-x+y=1
4x=8/: 4
5x-2y=7
x=2
-2y=7-10
-2y=-3/: (-2)
y=1,5
a) 4x+y=11
-4x+20y=52
21y=63
y=3
b)-2x+2y=-5
3y=2
y=2/3
x=6 i 1/3
2x-2y=-2
-10x+2y=-14
-8x=-16
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c)
5x-y=7
2x+2=2y
5x-y=7
2x-2y=-2/: (-2)
5x-y=7
-x+y=1
4x=8/: 4
5x-2y=7
x=2
-2y=7-10
x=2
-2y=-3/: (-2)
x=2
y=1,5
a) 4x+y=11
-4x+20y=52
21y=63
y=3
x=2
b)-2x+2y=-5
2x+y=7
3y=2
y=2/3
x=6 i 1/3
c)5x-y=7
2x-2y=-2
-10x+2y=-14
2x-2y=-2
-8x=-16
x=2
y=3