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Thumbs down Solving Equations - Higher .... HELP!!!! - November 17th 2009, 05:35 PM

Hey....

I'm really struggling with my maths at the moment. I have been taught how to work these equations out and I thought I was getting it...

However - I don't understand this question - neither does my Mathamatic Fanatic friend...

3b + 5 / 4 (Subtract) 5b - 13 / 3 = 1

(These are fractions - 3b + 5 OVER 4 && 5b - 13 OVER 3)

We have to find the value of b. Is this question actually possible?? If so how did you work it out. My Dad has made me work on it for over 2 hours since I've been home - I still haven't found the right answer!!

( You can check your answers by using the number you find to 'b' in the actual equations )

Any help would be great!!
Claire xx


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Re: Solving Equations - Higher .... HELP!!!! - November 17th 2009, 06:26 PM

Hey can you just use more parentheses next time? You clarified but it just makes it easier.

((3b+5)/4) - ((5b-13)/3) = 1

did I get that right?

Anyways, you find the LCD (least common multiple) of 3 and 4, which is 12. So you multiply the whole equation by 12, thus turning the denominators into numerators, to get:

3(3b+5) - 4(5b-13) = 12

then

(9b + 15) - (20b + -52) = 12

then combine

-11b + 67 = 12
-11b = -55
b = 5

hopefully that answers it, if not sorry and can you please clarify the problem?

cheers


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Re: Solving Equations - Higher .... HELP!!!! - November 17th 2009, 06:37 PM

^^^

That seems right to me...
and to check it substitute 5 into
((3b+5)/4) - ((5b-13)/3) = 1

((3x5 +5)/4) - ((5x5 -13)/3) = 1
((15+5)/4) - ((25 - 13)/3) = 1
(20/4) - (12/3) = 1
5 - 4 =1

So yep that works
   
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Re: Solving Equations - Higher .... HELP!!!! - November 17th 2009, 09:48 PM

I can never do maths on a computer screen/typed, it makes my brain hurt.
I always need to write it down
   
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Re: Solving Equations - Higher .... HELP!!!! - November 21st 2009, 06:23 PM

Hey,

Thanks everyone. That sure helped. I emailed my teacher too - and five was the right answer!

I think I go wrong when multiply negatives or the such...

Thanks Everyone =]

(A Mod can Close this now )


I'm still alive.
Must have been a miracle
It's been one hell of a ride
Destination still unkown
It's a fact of life: If you make one wrong move with a gun to your head
You better walk the line or you'll be left for dead.


I'm a runaway train on a broken track
I'm the ticker on the bomb that you can't turn back
Thats right.
I got away with it all and I'm still alive.
Let the end of the world come tumbling down.
I'll be the last man standing on the ground
As long as hot blood runs through my veins
I'm still alive.
   
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Re: Solving Equations - Higher .... HELP!!!! - November 21st 2009, 06:56 PM

Closed at OPs request.
   
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