x - cena za [tex]dm^3[/tex]
y - ilość paliwa w [tex]dm^3[/tex]
x*y - cena paliwa
a)
[tex]y = 25,36 dm^3\\x = 5,25 zl\\x*y = 25,36*5,25 = 133,14zl[/tex]
b)
[tex]x = 5,15 zl\\x*y = 64,89 zl\\y = \frac{64,89}{5,15} = 12,5 dm^3\\[/tex]
c)
[tex]y = 21,32 dm^3\\x*y = 110,86 zl\\x = \frac{110,86}{21,32} = 5,20zl[/tex]
