## ← Matching Notation - Visualizing Algebra

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Showing Revision 2 created 05/24/2016 by Udacity Robot.

1. For the first inequality, I have x is less than 3. If you have trouble
2. remembering the less than symbol, remember that the arrow points to the left, or
3. to numbers less than zero. I know I need a parenthesis because I can't be equal
4. to. So, it must be the number line 2 or number line 4. I want numbers lower than
5. 3, because x is less than 3, so it must be 4. For the interval notation, I want
6. numbers that are from negative infinity all the way up to 3. So, that must be b.
7. For x greater than or equal to 3, I want to use a bracket, that's number line 1.
8. The interval notation would be d because I get d equal to 3 and then have any
9. number bigger or up to positive infinity.
10. Here, I have 3 is greater than or equal to x. I'm used to seeing the variable on
11. the left side, so I'm going to flip this in equality around. I need to make sure
12. that the arrow still points to the x when I switch this inequality around. I
13. want 3 to be greater than or equal to x, and I want x to be less than or equal
14. to 3. For the number line, it must be at number 3. I need a bracket at 3 and my
15. values could be less than or equal to 3. The interval notation would be a. I
16. could have numbers from negative infinity all the way up, and equal to 3. This
17. must mean that the last one is 2c. I want numbers greater than 3. Here are
18. numbers greater than 3 and here are numbers between 3 and positive infinity.