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2x+y=11
2y=13-3x /:2
y=11-2x
2(11-2x)=13-3x
22-4x=13-3x
-4x+3x=13-22
-x=-9
x=9
y=11-2*9
x=9
y=-7
b)5x+3y=0/*2
-x-2y-7/*3
10x+6y=0
-3x-6y=21
7x=21
x=3
-3-2y=7
-2y=7+3
y=-5
c)3u+2v=2/*4
5u+4v=6/*(-2)
12u+8v=8
-10u - 8v=-12
2u=-4
u=-2
3*(-2) +2v=2
2v=8
v=4
d) 3s+5t=-6
1.5 - 2t=-3
-2t=-3-1.5
-2t=-4.5
t=9/4
3s+5*9/4 = -6
3s=-6-45/4
3s=-69/4
s=-23/4
e) 5=3x-y /*(-2)
7=5x-2y
-10=-6x+2y
7=5x-2y
-3=-x
x=3
5=3*3-y
-4=-y
y=4
f) x-3y=5/*(-3)
3x +y=-5
-3x+9y=-15
3x+y=-5
10y=-20
y=-2
x-3*(-2)=5
x+6=5
x=-1