Lilly and alex went to a mexican restaurant. lilly paid $9 for 2 tacos and 3 enchiladas, and alex paid $12.50 for 3 tacos and 4 enchiladas. set up the
system of equations.

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?