posted by Mariel on .
Sam and Chris went to “Lots O Fun” to play laser tag and video games for Chris’s birthday. Sam played 3 games of laser tag, 5 video games, and spent $17 total. Chris played 4 games of laser tag, 7 video games, and spent $23 total. How much does one video game cost to play?
L=laser tag, V=video games
Since the question asks only about the video games, we want to eliminate the L's. We can do this by multiplying the first equation by 4 and the second equation by -3.
Add 3 and 4 together.
Video games are $1 each. If you had to solve for laser tag, you would the substitute v=1 into equation 1 or 2.