How do I draw a number line for all numbers that are exactly two units from 5?
I don't know why your question hasn't been responded to, unless, maybe it's because it seems a bit trivial in nature. On a number line, there are only two points that are exactly two units from 5. They would be 3 and 7. That's it. Just draw a line, set intervals from 0 to 8 or so and then circle the 3 and the 7. See diagram.
1. Draw a number line. That is, draw a straight line, and mark points 0, 1, 2, 3, ... going to the right, -1, -2, -3, ... going to the left of 0.
2. Look at the point labeled 5. 2 places to the right of that is, as you say, 7. Mark that point with, say, a dot.
3. Look 2 places to the left. That is, as you say, 3. Mark that point with a dot.