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a)
Byl "czeski" blad
0,3x+0,4y=0,9 /*10
1,4x+1,3y=4,2 /*10
3x+4y=9 /*(-14/3)
14x+13y=42
-14x-56/3y=-42
14x+13y=42
---------------+
13y-56/3y=0
y=0
3x=9
x=3
b)
y-x=0
y+x=0
-----------+
2y=0
y=0
x=0