Which is the largest fraction? 3/4, 7/8, 8/10 or 7/9

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?

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

What is the result of adding the system of equations? 2x+y=4 3x-y=6