Question 617476
With the information we get from you, the most we can do is write y as a function of x,
as in {{{y=sqrt(10^2+x^2)}}} --> {{{y=sqrt(100+x^2)}}}
If there was some other information, such as the measure of an angle,
we could get actual number measurements.
Extra information may be given in a subtle, not obvious way, such as markings indicating that the two acute angles are congruent.
If the two acute angles were congruent, the triangle would be an isosceles right triangle, the legs would have the same measure (so x would be 10), and you could use the Pythagorean theorem to find that {{{y=sqrt(10^2+10^2)=sqrt(200)=sqrt(100*2)=10*sqrt(2)}}}