Write an equation for the number of minutes Gian spends playing games, y, if he spends x minutes watching videos.

Question

Gian is allowed to spend 45 minutes on the computer after dinner. He spends his entire 45 minutes either watching videos or playing games.

Answer 1

If the total time spent is 45 minutes, and the entire 45 minutes is made up of either playing games (y) or watching videos (x), then adding the two activities together should equal 45 minutes. So

x+y=45

The question asks you to solve for the time spent playing games (y), so just subtract x from both sides

x+y=45

y=45-x