The hypotenuse of the right triangle measures 3 units.
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How to find the hypotenuse?</h3>
Here we know that both legs measure:

If we use the Pythagorean theorem, we will see that the hypotenuse H can be written as:

Then we conclude that the hypotenuse of the right triangle measures 9 units.
If you want to learn more about right triangles:
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The answer is 35/2 or 17.5
That would be elimination. you could do it with substitution but i like using elimination more than substitution when theres more than 2 variables