Please help! Determine the value. First person gets brainliest!

Answer: 4√5
Step-by-step explanation:
8^2+y^2=12^2
64+y^2=144
y^2=80
y=√80---[Simplify]-->4√5
a^2+b^2=c^2
8^2+b^2=12^2
64+b^2=144
b^2=80
b= 4[tex]\sqrt{5}[/tex]
hopefully this helped have a nice day!