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B.-6x+y=2 => y=6x+2 rosnąca a>0
C.3x+y=1 y=-3x +1 malejąca a<0
D.1/2x-y=10 -y=-1/2x+10 => y=1/2x-10 rosnąca a>0
Odp C.
Sprawdzamy:
A. 2x-3y=6
-3y=6-2x /:(-3)
y=-2+2/3x rosnaca
B. -6x+y=2
y=6x+2 rosnaca
C. 3x+y=1
y=-3x+1 malejaca bo a<0
D. 1/2x-y=10
-y=10-1/2x
y=-10+1/2x rosnąca
prawidłowa odp.C