tylko zadanie 6 d,e,f
D.
2x+y=13
x-1/2y=2 \ *(-2)
-2x+y=-4
2y=9\ /2
y=4i1/2
2x+4 i 1/2=13
2x=13-4 i 1/2
2x=8 i 1/2\ /2
x=4 i 1/2
x=4 i 1/4
y= 4 i 1/2
E.
6x+9y=15\ /3
2x+3y=3
-2x-3y=-5
0=-2 r. sprzeczne
F.
1/2x-y=1\ *(-2)
x-2y=2
-x+2y=-2
0=0
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D.
2x+y=13
x-1/2y=2 \ *(-2)
2x+y=13
-2x+y=-4
2y=9\ /2
y=4i1/2
2x+4 i 1/2=13
2x=13-4 i 1/2
2x=8 i 1/2\ /2
x=4 i 1/2
x=4 i 1/4
y= 4 i 1/2
E.
6x+9y=15\ /3
2x+3y=3
-2x-3y=-5
2x+3y=3
0=-2 r. sprzeczne
F.
1/2x-y=1\ *(-2)
x-2y=2
-x+2y=-2
x-2y=2
0=0