If you mean on a number line,
Draw a line and label "5" on it.
Since 5 < a means that a is greater than 5, draw an open circle at 5 (closed circle would be for greater than/equal to)
Then shade the line to the right (greater would be going in the positive direction on a number line.)
And add in an arrow at the end to show that a goes on infinitely.
It might be easier to understand if you change 5< a to a>5
when you swap sides you have to turn the inequality sign around.
Kitty<3, how did you draw and insert that number line?