There are only a few things you need to know about number lines for the SAT.

An example:

Two points on a number line are both 6 units from -2. What is the distance between them?

A) 0

B) 2

C) 12

D) -8

**Strategy:**

**If you are not given a picture of the number line, draw your own.****Determine if you have an inequality to deal with or not.****Apply the basic rules for determining distance between two points.**

Rules about number lines:

- They continue infinitely in both directions
- The distance between two points is always the absolute value – it can never be negative
- An open circle means that number is NOT included
- A filled-in circle means that number IS included

You may remember this from the inequalities unit, where -1 < *x* ≤ 2. That would be graphed as:

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