Answer
$(8,5)$ is not a solution of the system.
Work Step by Step
An ordered pair is a solution to the system if it satisfies both equatons:
$ \begin{array}{lllll}
5(8)-4(5) & =20 & .... & 3(5) & =2(8)+1\\
-800+700 & =-100 & & 15 & =16+1\\
-100 & =-100 & & 15 & =17\\
TRUE & & & FALSE &
\end{array} $
$(8,5)$ is not a solution of the system.
