Answer:
C.y=5, x=10
Explanation:
In this case when you have a triangle that is being cut by paralell lines you can use the Triangle Proportionality Theorem, which states that a triangle that is cut by a parallel line to any side the resultant sides would be proportional to those of the original triangle.
So you equation would be like this:

If you clear the function to get the value of X it´ll look like this:



Now that we have calculated the length of Y we can calculate the length of X
Since

Then



So the value of X would be 10.