Układ równań:
a) 2x-y=11 3x+2y=-62
b) 6x+y=29 -3x+7y=23
c) 7x-3y=15 5x+6y=27
d) 2x-5y=-2 3x-6y=1
e) 3x+4y=56 2x-4=13
f) 2x+7y=42 -x+4y=39
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2x-y=11/*2
3x+2y=62
4x-2y=22
3x-2y=62
7x=84
x=12
2*12-y-11
x=12
-y=-35/-1
x=12
y=35
b 6x+y=29
-3x+7y=23/*2
6x+y=29
-6x+14y=46
15y=75
y=5
6x+5=29
6x=24
x=4
c 7x-3y=15/*2
5x+6y=27
14x-6y=30
5x+6y=27
19x=57
x=3
5*3+6y=27
x=3
6y=27-15/6
x=3
y=2
d 2x-5y=-2/*-3
3x-6y=1/*2
-6x+15y=6
6x-12y=2
3y=8/3
y=2,66
2x-5*2,66=-2
y=2,66
2x=-2+13,3/2
y=2,66
x=5,65
e3x+4y=56
2x-4y=13
5x=69/5
x=13,8
3*13,8+4y=56
x=13,8
4y=56-41,4/4
y-=3,65
f 2x+7y=42
-x+4y=39/*2
2x+7y=42
-2x+8y=78
15y=120/15
y=8
2x+7*8=42
y=8
2x=42-56/2
x=-3