This Blog exists for the collective benefit of all algebra students. While the posts are 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.
On #35 my answer is switched around from the books answer. My answer: 4 >= -x Book A: -4 >= x I did: -3(x-3) >= 5-4x -3x+9 >= 5-4x +3x +3x 9 >= 5-x -5 -5 4 >= -x I can't find what I did wrong, please help.
For #31 on pg 190:
ReplyDeleteI distributed the -2 to the 6 and s. then got
-12(-25)>= -15-2s. I added 2s to both sides then came out with -12 >= -15.
On #35 my answer is switched around from the books answer.
ReplyDeleteMy answer: 4 >= -x Book A: -4 >= x
I did:
-3(x-3) >= 5-4x
-3x+9 >= 5-4x
+3x +3x
9 >= 5-x
-5 -5
4 >= -x
I can't find what I did wrong, please help.
I can't figure out how to set up #45.
ReplyDeleteFor #39 my answer was -n <= 2. The book has the inequality symbol reversed and n as a positive # and 2 as -2.
ReplyDeleteI did:
4-2n <= 5-n+1
4-2n <= 6-n
+n +n
4-n <= 6
-4 -4
-n<= 2
5-n+1 is not 6n since the 1 is not a like term and cannot be combined with the 5n....could that be where the problem is?
ReplyDeleteHi Maggie... in #35 & #39, you have to remember to solve for the variable... for instance, in #35, you have
ReplyDelete-x <= 4
you still have to divide both sides by -1 in order to solve for x. Of course, when you divide by -1, the inequality symbol will reverse (aka flip).
We'll go over the rest in class.
Mr. C.
What is a c over a line, what does it mean, you never told us!
ReplyDeleteThe underlined "C" that you reference (it looks more like an underlined sideways "U" to me) means "subset." See page 195.
ReplyDeleteSoccer players are a subset of the set of athletes.
Oranges are a subset of the set of fruit.
The natural numbers are a subset of the set of whole numbers.
Rational numbers are a subset of the set of real numbers.
Oh, that makes sense
ReplyDelete