SOLUTION: Caitlyn and Daniela are going out for pizza to their local gourmet pizza shop. They order a pizza with a total of 5 toppings. The restaurant charges 8 dollars for a pizza, plus $1

From the problem, it is clear that they bought one pizza;

so they spent 15-8 = 7 dollars for toppings.


Thus you have this system of two equations


     x +  y = 5    (1)     (counting toppings)

    1x + 2y = 7    (2)     (counting money)


Easy check by inspection shows that only option B is the solution.