Dla x = cena duzej pizzy
cena malej pizzy: x-12
[tex]2(x-12)+x=84\\ 2x-24+x=84\\ 3x=84+24\\ 3x=108\\ x=36[/tex]
[tex]x-12=36-12=24[/tex]
[tex]2*24=48\\ 48-36=12[/tex]
Odp. Litera x Jurek oznaczyl cene duzej (B) pizzy.
Odp. Dwie male pizze sa o 12zl (C) drozsze niz jedna duza pizza.