We find z using Pythagorean's Theorem.
[tex]\begin{gathered} z^2=10^{^2}+8^2 \\ z=\sqrt[]{100+64}=\sqrt[]{164} \\ z\approx12.8 \end{gathered}[/tex]We find the acute angle between z and 10 using a sine function.
[tex]\begin{gathered} \sin \theta=\frac{8}{\sqrt[]{164}} \\ \theta=\sin ^{-1}(0.62) \\ \theta\approx38.7 \end{gathered}[/tex]Now, we find the angle between x and y using the interior angles theorem.
[tex]\begin{gathered} 38.7+90+\beta=180 \\ \beta=180-90-38.7 \\ \beta=51.3 \end{gathered}[/tex]Then, we use the tangent function to find x.
[tex]\begin{gathered} \tan \beta=\frac{8}{x} \\ x=\frac{8}{\tan 51.3} \\ x\approx6.4 \end{gathered}[/tex]At last, we find y using Pythagorean's Theorem.
[tex]\begin{gathered} y^2=x^2+8^2 \\ y=\sqrt[]{(6.4)^2+64}=\sqrt[]{104.96} \\ y\approx10.2 \end{gathered}[/tex]