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
So the value of X would be 10.
A. x=9 z=2
well idk how to do it i just got the answer right on e2020