You can put this solution on YOUR website! The answer to the question is NO.
If you are adding the condition that both legs are of equal length, then your question changes to , "Is it possible to find two legs of equal length in a triangle if you know the hypotenuse?"
This answer becomes, YES.
The first case is for hypotenuse length c being known.
x and y are unknown variables.
The second case is for hypotenuse length c being known and x=y.
You can assign another variable to x and y, such as L=x and L=y; and then you have , which is the result for x and for y.