This Blog exists for the collective benefit of ALL Algebra students. While the posts are usually specific to Mr. Chamberlain's class, any and all "algebra-ticians" are welcome. The more specific your question (including your own attempts to answer it) the better.

I have another question for you on the homework, but there is no blog post so once again I am writing you an email. For problem 11 in section 3-6, I get the problem down to 4 ≤ y+2 ≤ 3y+30. After this, I subtract 3y from all sides, and get 3y+4 ≤ 4y+2 ≤ 30. After this, I get lost. Did I mess up with my math before I got to 4 ≤ y+2 ≤ 3y+30, or am I just over thinking it?

When you have a 3-way "tweener" with the variable on more than just one side, you will have to split it into TWO SEPARATE INEQUALITIES in order to solve it.

You are correct, Sparkle... my answer still stands... I wasn't even looking at his/her math, I was just saying that the approach should be to split the compound inequality into two separate inequalities and then solve.

Set-builder Notation has been explained many times in class.

You were given a handout/study guide that describes it in detail.

There are several practical examples of using set-builder notation in a few of my MathChamber Academy videos, such as; http://www.screencast.com/t/7ukc4i7J or http://www.screencast.com/t/dBQGhcnMR

Set-builder notation has probably been demonstrated every day in class for the last 3 weeks.

I have been available for extra help almost every morning and the last two full afternoons after school.

And you choose to ask this question the night before the test?

I have another question for you on the homework, but there is no blog post so once again I am writing you an email. For problem 11 in section 3-6, I get the problem down to 4 ≤ y+2 ≤ 3y+30. After this, I subtract 3y from all sides, and get

ReplyDelete3y+4 ≤ 4y+2 ≤ 30. After this, I get lost. Did I mess up with my math before I got to 4 ≤ y+2 ≤ 3y+30, or am I just over thinking it?

When you have a 3-way "tweener" with the variable on more than just one side, you will have to split it into TWO SEPARATE INEQUALITIES in order to solve it.

Deletei.e.

4 ≤ y+2 AND y+2 ≤ 3y+30

Solve the separately, and you'll be all set.

Capeesh?

Capeesh

DeleteShouldn't it be -3y+30? Because you would be distributing -3 to y which would mak3 it -3y. Therefore, you should be adding 3y not subtracting 3y

DeleteYou are correct, Sparkle... my answer still stands... I wasn't even looking at his/her math, I was just saying that the approach should be to split the compound inequality into two separate inequalities and then solve.

DeleteNow... get some SLEEP!!

Deletefyi.. I won't be around much tonight, so if you have questions, hopefully some of you can answer for each other...

ReplyDeleteThe homework that is stated above, will problems like those be on the TEST?

ReplyDeleteObviously

DeleteI looked on math chamber. I can't see any videos of the set builder notation. And I don't understand it at all. Do you have a video

ReplyDeleteSet-builder Notation has been explained many times in class.

DeleteYou were given a handout/study guide that describes it in detail.

There are several practical examples of using set-builder notation in a few of my MathChamber Academy videos, such as;

http://www.screencast.com/t/7ukc4i7J

or

http://www.screencast.com/t/dBQGhcnMR

Set-builder notation has probably been demonstrated every day in class for the last 3 weeks.

I have been available for extra help almost every morning and the last two full afternoons after school.

And you choose to ask this question the night before the test?

i just want to make sure i have this correct. would [25, 50) be 25<_x<50 (this is problem 3-6 #18)

ReplyDeleteYep

DeleteDouble-yep.... assuming that you meant 25 <= x < 50

Delete