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s sek= 1/3600 s godz
b)
a+3b-6=-9
1/3a+b-2=x /×3
a+3b-6=x
x=-9
5a+15b-31=x /:5
a+3b-6,2=x
a+3b-6-0.2=x
x=-9-0.2
x=-9.2
x minut = 1/60x godziny
s sekund = 1/3600 s godziny
5a+15b-31=5*-9+15*2-31=-45+30-31=-46
a=-9
b=2
przykład a) w załaczniku