Solution:
We have 
Use the addition rule and get
Now from the equality of matrices we can write
Thus 
Find the values of 
![2\left[\begin{array}{ll} 1 & 3 \\ 0 & x \end{array}\right]+\left[\begin{array}{ll} y & 0 \\ 1 & 2 \end{array}\right]=\left[\begin{array}{ll} 5 & 6 \\ 1 & 8 \end{array}\right]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-e3b199653bed94af618cb5f0d4f0ec35_l3.png "Rendered by QuickLaTeX.com")
Solution:
We have
Use the addition rule and get
Now from the equality of matrices we can write
Thus
