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|5u+4v = 6
-6u-4v=-4
5u+4v=6
-u=2
u=-2
3u+2v=2
6+2v=2 |-6
2v=-4
v=-2
b) |3s+5t = -6
|1,5s-2t = -3 |*(-2)
3s+5t=-6
-3s+4t=6
9t=0
t=0
3s+5t=-6
3s+0=-6
3s=-6
s=-2
c) |5 = 3x - y |*(-2)
|5x-2y = 7
-10=-6x+2y
5x-2y=7
-x=-3
x=3
5x-2y=7
15-2y=7 |-15
-2y=-8
y=4
d) |x-3y = 5
|y+3x = -5 |*3
x-3y=5
3y+9x=-15
10x=-10
x=-1
x-3y=5
-1-3y=5 |+1
-3y=6
y=-2
2.
a) x+2y = -13 |*2
2x+4y=-26
b) 3x+y = -5 |*2/3
2x+2/3y = -10/3
c) -x+4y = 2 |*(-2)
2x-6y=-4
d) x-½y = 1 |*2
2x-y=2
e) 3x-3y = 1 |*2/3
2x-2y=2/3
f) x+¾y = 0 |*2
2x+6/4y=0
nie wiem czy to drugie na pewno jest dobrze.