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Algebra Help--solved. Thanks, Concrete_Rose!

 
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liesnalibis View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote liesnalibis Quote  Post ReplyReply Direct Link To This Post Topic: Algebra Help--solved. Thanks, Concrete_Rose!
    Posted: Dec 14 2013 at 2:56am
And once I master this I'll have to go back and to some more adding and subtracting of fractions to make sure I can remember the rules are different.
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_ConcreteRose_ View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote _ConcreteRose_ Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:54am
no problem!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote liesnalibis Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:54am
Ok, thanks, I'm stickying these rules in my practice book next to these sections.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote _ConcreteRose_ Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:50am
In addition to what I said before:

The difference is you just crossed out the 4's in the denominator. But you can only cross something out when it cancels with something else. The 4's in the denominator cancels with the 4s in the numerator.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote _ConcreteRose_ Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:48am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote liesnalibis Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:46am
You know what, I see what I did wrong. I think I'm trying to carry over rules from adding and subtracting fractions to multiplying and dividing fractions. You know how when for example

  5          3
----  +  ----
  4          5

you're supposed to multiply each denominator by each other to get them over the same denominator. I was trying to do that with those recent problems. Wow, thanks, I never caught that.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote liesnalibis Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:41am
Originally posted by _ConcreteRose_ _ConcreteRose_ wrote:

Okay, Well the first problem is this: what you do to one side you have to do to the other.  If you multiply by positive 4 on one side, you have to multiply by positive 4 on the other. Or you could do negative 4 on both sides.

Secondly, you did the same thing you did on the other problem. What happened to the 4s in the denominator?


Okay, thanks, this is a good rule to remember.

And I crossed out the 4s because they were both over the same denominator.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote _ConcreteRose_ Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:37am
Okay, Well the first problem is this: what you do to one side you have to do to the other.  If you multiply by positive 4 on one side, you have to multiply by positive 4 on the other. Or you could do negative 4 on both sides.

Secondly, you did the same thing you did on the other problem. What happened to the 4s in the denominators?
If you cross out the 4s in the denominator you have to do the same in the numerator. 


Edited by _ConcreteRose_ - Dec 14 2013 at 2:39am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote liesnalibis Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:36am
I figured since I multiplied both sides by the opposite denominator I could cross out the denominator and work with it that way. And the crazy thing is all the bait answers were similar (it is multiple choice) to my wrong answer, just with different signs.


Edited by liesnalibis - Dec 14 2013 at 2:38am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote liesnalibis Quote  Post ReplyReply Direct Link To This Post Posted: Dec 14 2013 at 2:33am
Sorry for the wait...writing in Paint takes so long!

But this is what I got when I did it like this. Can you tell me why this came out wrong?


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