Let:
x = Number of tickets
y = Number of large popcorns
z = Number of small drinks
Three people went to the movies and they each purchased a large popcorn and small drink. so:
[tex]\begin{gathered} 5.00x+4.50y+2.25z \\ 5.00(3)+4.50(3)+2.25(3) \\ 3(5.00+4.50+2.25)=3(11.75)=35.25 \end{gathered}[/tex]