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2x+y=11 / * (-3)
6x+4y=26
-6x-3y=-33
________________
y= -7
3x+2*(-7)=13
3x-14=13
3x=-1 /:3
x=- 1/3
y=-7
x=- 1/3
b)5x+3y=0
-x-2y=7 /*5
5x+3y=0
-5x-10y=35
____________
-7y=35 /:(-7)
y=-5
5x+3(-5)=0
5x-15=0
5x=15 /:5
x=3
y=-5
x=3
c)3u+2v=2 /*(-5)
5u+4v=6 /*3
-15u-10v=-10
15u+12v=18
______________
2v=8 /:2
v=4
3u+2v=2
3u+2*4=2
3u+8=2
3u=-6 /:3
u=-2
v=4
u=-2
d)3s+5t=-6
1,5s-2t=-3 /*(-2)
3s+5t=-6
-3s+4t=6
__________
9t=0 /:9
t=0
3s+5*0=-6
3s=-6 /:3
s=-2
t=0
s=-2
e)5=3x-y
5x-2y=7
3x-y=5 /*(-5)
5x-2y=7 /*3
-15x+5y=-25
15x-6y=21
___________
-y=-4 /:(-1)
y=4
3x-y=5
3x-4=5
3x=9 /:3
x=3
y=4
x=3
f)x-3y=5
y+3x=-5
-3y+x=5
y+3x=-5 /*3
-3y+x=5
3y+9x=-15
______________
10x=-10 /:10
x=-1
-3y+x=5
-3y-1=5
-3y=6 /:(-3)
y=-2
x=-1
y=-2