Answer:
[tex]L+S=413----------------1\\\\1.2L+3S=1068---------2[/tex]
Step-by-step explanation:
Step one:
given data
A vendor sold a total of 413 fries
Large fries cost $1.20 and souvenir sodas cost $3
let L be the number of large fries sold and S be the number of souvenir sodas
so
L+S=413
and
1.2L+3S=1068
Therefore the system of equation is
[tex]L+S=413----------------1\\\\1.2L+3S=1068---------2[/tex]