Finding all 2 by 2 matrices that have eigenvalues x and y

I have been pulling my hair in solving the following problem and I have reached to the deadline. If anyone can give me an idea of how can I solve the problem, please help me...

Problem: Find all the 2 by 2 matrices that have **x** and **y** as eigenvalues.

You may replace the values of **x **and **y**, say by 4 and 5 to show me an example of how the problem can be solved...

Thank you very much for your time... It means a lot to me... Hope to get some idea of how the problem can be solved....