Find the missing side b in a right triangle where a=8 and c=18

Using Pythagorean theorem c^2=a^2 + b^2, we can find the missing side b.
Put values in equation.
18^2 = 8^2 + b^2
324=64+b^2
Subtract 64 from both sides
260= b^2
Take square root.
2√65=b
or
b=16.12

b=2√65  Radical form. or b=16.12 Decimal form.

Yes the slope to this is -5