And/Or Inequalities and Absolute Values

[Yodamaster]

Hi, I have my midterms for Algebra I tommorow, and looking at this site has helped me to review and explained some things I didn't know in a simple way. However, I'm having some trouble remembering how to do And/Or inequalities and absolute value problems. I don't remember exactly what they're called, so I didn't see it in the lesson list. Examples would be

|a+b| < c

|a+b| > c

If I remember correctly, the first one is an "and" problem, and the 2nd one is an "or", but how would I do those again?

What I think I know for the first one is

Drop the lines.
a+b < c
a+b > -c
And to graph it.
O--------O
_________________________________
And the second

Drop the lines.
a+b > c
a+b < -c
And to graph it.
<----O O----->

And the circles would be filled if it was > or equal too.

I don't know how to use fancy text to get the actual characters for equations (< or equal too sign, which is the < with the line under it for example). If anyone could help me do that it would be appreciated. Thank you.

 

[stapel]

...how would I do those again?

To learn, study at least two online lessons, making sure to follow through the worked examples.

I don't know how to use fancy text to get the actual characters for equations (< or equal too sign, which is the < with the line under it for example).

You can learn how to use LaTeX by following the appropriate links in the "Forum Help" pull-down menu at the very top of every forum page. To underline, use the "u" button in the formatting line above the message-entry box. (You can find more information about this by reviewing the article regarding BBCode.) For information on how to type math as plain text, try here.

Eliz.