Inequalities.

Question

Right, so I learned inequalities last year or the year before or something, but I totally forgot most of it. I can still do simple ones, but I completely blank out when I need to do something with more than one inequality sign.

Also, graphing inequalities and on a number line.............

....................

How? O-O;

Any help would be appreciated, thanks!

Answer 1

Basically, to remember the difference of greater than or less than, whichever the inequality sign is facing (the alligator mouth), that is the greater one. (The alligator wants to eat the bigger number. This is what I learned when I was younger.) I use to have trouble with that too.

Then, for graphing inequalities, a closed dot means greater/less than or equal to. A open dot just means greater or less than.

Also, when you have an inequality equation like -3x> 18, remember to switch the sign when dividing by a negative number.

Hope this helps!!

Comments

Thanks, I needed the reminder about the sign switching and the closed/open dot. But do you know how to do ones like this?

4 > 3x < 6 (lame example)

for example? That's what I really need help with.

Answer 2

what are inequalities?

I dont know so I am very sorry:(

But i found this website that looks good for you to use

www.mathsisfun.com/algebra/inequality-solving.html

Comments

Looks like a great reference. Main thing for me with them is remembering to reverse things if you multiply an equation by a negative number.

Graphing just requires being very careful with the open circle vs solid dot if it can also be equal and making the patterns clear and unique.