Solution:
Given the function below
[tex]y=x-3[/tex]Where
[tex]\begin{gathered} y\text{ is the output value} \\ x\text{ is the input value} \end{gathered}[/tex]If the output value is 5, the input value will be
[tex]\begin{gathered} y=x-3 \\ Where,\text{ y}=5 \\ 5=x-3 \\ Collect\text{ like terms} \\ x=5+3=8 \\ x=8 \end{gathered}[/tex]Hence, the input value is 8