Question

choose the system of equations in x and y describing the situation

Answer 1

let's say
x = fries
y = hamburgers

5 fries + 5 hamburgers + 2 drinks = 17
2 fries + 4 hambugers + 4 drinks = 14

5x + 5y + 2 = 17
2x + 4y + 4 = 14

Answer 2

Since all drinks $1, that eliminate the variable for drinks:
5x + 5y + 2 = $17
2x + 4y + 4 = $14