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a) 8*(-1/2)+3*1/3=-4+1=-3 ok
b) 8*1/4+3*(-1/6)=2-1/2=1,5 nie
c) 8*3/4+3*1/2=6+1,5=7,5 nie
d) 8*(-3/4)+3*(-1/2)=-6-1,5=-7,5 nie
2. a) x=0 y=20
x=1 y=17
x=2 y=14
x=3 y=11
x=4 y=8
b) x=1 y=-1
x=2 y=-2
x=3 y=-3
x=4 y=-4
x=5 y=-5
c) x=2 y=5
x=6 y=4
x=10 y=3
x=14 y=2
x=18 y=1
d) x=1 y=1
x=3 y=2
x=5 y=3
x=7 y=4
x=9 y=5