Aufgabe 2)
1: 2x-6y=6 |*5
2: 5x+3y=42 |*2
------------------------------
1 ':10x -30y= 30
2' :10x +6y= 84
----------------------------
1' - 2'):
-36y= -54
y= 3/2
x= 15/2
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Aufgabe 1:
-4x-y=40 |*5
x+5y= 9
----------------
-20x -5y=200
x+5y= 9
----------------
1+2:
-19x =209
x= -11
y=4
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Aufgabe 3:
4x+2y=4 |*1.5
-6x+3y=33
-----------------
6x +3y =6
-6x+3y=33
--------------
1+2)
6y=39
y=13/2
x=-9/4