How would you graph the result of -3 plus 5 as a point on the number line?

Draw the number line (horizontally) and mark -3;

To add +5 go 5 marks to the right;

Either mark each step right as a little arc above the line, or mark one large arc from the -3 to 5 marks to its right:

_________________________________________________

_____________-_____-_____-____-_____-_____________

____________/_\___/_\___/_\___/_\___/_\____________

___________/___\_/___\_/___\_/___\_/___\___________

-----+-----+-----+-----+-----+-----+-----+-----+-----

__________-3_______________0__________2__________

__________________________________________________

or

__________________________________________________

______________--------------------------______________

_____________/______________________\_____________

____________/________________________\____________

___________/__________________________\___________

-----+-----+-----+-----+-----+-----+-----+-----+-----

__________-3_______________0__________2__________

__________________________________________________

You could put an arrow head at the right hand end of each arc.