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3x-y=-8 |·(-2)
x-2y=-6
-6x+2y=16
x-2y=-6
---------------------
-5x=10 |:(-5)
x=-2
-2-2y=-6
-2y=-4 |:(-2)
y=2
d)
2x+3y=5
3x-y=13 |· 3
2x+3y=5
9x-3y=39
-----------------------
11x=44 |: 11
x=4
2·4+3y=5
3y=5-8
3y=-3 |:3
y=-1
e)
3x-2y=-1 |·3
2x+3y=8 |·3
9x-6y=-3
6x+9y=24
----------------------------
15x=21 |: 15
x=21/15 = 7/5
3·7/5-2y=-1
21/5-2y=-1
-2y=16/5 | :(-2)
y=8/5
f)
5x+7y=3 |·(-3)
3x-4y=10 |·5
-15x-21y=-9
15x-20y=50
--------------------------
-41y=41 | (-41)
y=1
5x+7·1=3
5x=-4 |:5
x=-4/5