Hi there!
Let r be the number of matches that Rebecca's team won.
We know that Katheryn's team won 9 more matches than Rebecca's team, and we know that Katheryn's team won 52 matches.
Using this given information, we can create the following equation.
[tex]r+9=52[/tex]
If you wish to solve this, we can subtract both sides by 9 to get the following value for r.
[tex]r=43[/tex]
Have an awesome day! :)
~collinjun0827, Junior Moderator