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Ellie May 02-10-2010 11:12 AM
Math People...In Here Please
 
Solve using the elimination method:

4u - 3v = 1
3u + 4v = 6

Find u and v.

I have the answer with solution manual, but they want you to start at a certain point and only explain it if you pick their number to start at (if I didn't have the manual, I wouldn't know where they wanted me to start...).

So, I multiplied the top of 4 to get:
16u -12v = 4

and the bottom by 3 to get:
9u + 12v = 18

Now we get:
25u + 0v = 22
25u = 22

u = 22/25

Now substituting 22/25 in for u in the first equation, we get:
4(22/25) - 3v = 1
4 x 22/25 = 88/100 or 22/25
22/25 - 3v = 1
-3v = 1 22/25
Dividing by -3v, we get:
v = 1 22/25 divided by -3

Changing 1 22/25 to an improper fraction:
47/25 divided by 3

When dividing fractions, don't ask why, just flip the sucker and multiply:
47/25 x 1/3 = 47/75
Or in case I flipped the wrong one :rolleyes::
25/47 x 3/1 = 75/47

The book is saying my value for u is correct, but not v.
What in the heck am I doing wrong???

Ellie May 02-10-2010 11:21 AM
ETA:
I see that I didn't - my last couple 3's, but I still can't figure it out.:confused:

Wylie's Mom 02-10-2010 11:23 AM
Quicksilver, get your butt in here :p.

I'm a math person, but I think this just gave me a palpitation.

allisongaines 02-10-2010 11:30 AM
4u-3v=1
3u+4v=6

4(4u-3v=1)
3(3u+4v=6)

16u-12v=4
+ 9u+12v=18
the -12v and +12v cancel and youre left with
25u = 22
u = 22/25

plug u into the first eq (4u-3v=1) to get v
to check you can plug in both values to see if they equal 1 or 6

i hope im doing it right.. its been forever.

allisongaines 02-10-2010 11:33 AM
oh i think i know where you went wrong...
22/25 x 4 isnt 88/100... its 88/25
its easier if you look at decimals than fractions.
so 22/25 is 0.88 and 4 x 0.88 is 3.52
3.52-3v=1
solve for v

Robin Lodal 02-10-2010 11:46 AM
Quote:
Originally Posted by Ellie May (Post 2997322)
Solve using the elimination method:

4u - 3v = 1
3u + 4v = 6

Find u and v.

I have the answer with solution manual, but they want you to start at a certain point and only explain it if you pick their number to start at (if I didn't have the manual, I wouldn't know where they wanted me to start...).

So, I multiplied the top of 4 to get:
16u -12v = 4

and the bottom by 3 to get:
9u + 12v = 18

Now we get:
25u + 0v = 22
25u = 22

u = 22/25

Now substituting 22/25 in for u in the first equation, we get:
4(22/25) - 3v = 1
4 x 22/25 = 88/100 or 22/25
22/25 - 3v = 1 here you need to SUBTRACT instead of add PLUS what allison said. should be -3v = 1 - 88/25
-3v = 1 22/25
Dividing by -3v, we get:
v = 1 22/25 divided by -3

Changing 1 22/25 to an improper fraction:
47/25 divided by 3

When dividing fractions, don't ask why, just flip the sucker and multiply:
47/25 x 1/3 = 47/75
Or in case I flipped the wrong one :rolleyes::
25/47 x 3/1 = 75/47

The book is saying my value for u is correct, but not v.
What in the heck am I doing wrong???

still looking through but that's one thing i saw..

Ellie May 02-10-2010 11:50 AM
Quote:
Originally Posted by allisongaines (Post 2997369)
oh i think i know where you went wrong...
22/25 x 4 isnt 88/100... its 88/25
its easier if you look at decimals than fractions.
so 22/25 is 0.88 and 4 x 0.88 is 3.52
3.52-3v=1
solve for v
That would be:
3.52 - 3v = 1
-3v = -2.52
v- -2.52 divided by -3
v = .84 or 84/100 or 21/25

YAY!
Thank you :)

Ellie May 02-10-2010 11:51 AM
Thanks everyone. :)

This book uses fractions, not decimals. :mad:
So I have to convert back to fractions for my answer.

Robin Lodal 02-10-2010 11:55 AM
Quote:
Originally Posted by Ellie May (Post 2997391)
Thanks everyone. :)

This book uses fractions, not decimals. :mad:
So I have to convert back to fractions for my answer.
Do you have a graphing calculator... it will do the conversions for you. ;)

Ellie May 02-10-2010 11:57 AM
Quote:
Originally Posted by Robin Lodal (Post 2997396)
Do you have a graphing calculator... it will do the conversions for you. ;)
Nope.
I think it is just about time to get one though.

Robin Lodal 02-10-2010 12:04 PM
Quote:
Originally Posted by Ellie May (Post 2997402)
Nope.
I think it is just about time to get one though.
They will make a lot of things a breeze. I would check ebay. I have bought a few there before. I am a nerd and I think I have 4 lol I tutor in Math and so its always good to have one handy. ;)

Ellie May 02-10-2010 12:12 PM
Quote:
Originally Posted by Wylie's Mom (Post 2997344)
Quicksilver, get your butt in here :p.

I'm a math person, but I think this just gave me a palpitation.
lol, you can do it. :)

fourdez 02-12-2010 01:15 PM
Oh man !! That's freightening !!! I was having a hard time finding someone to show me where 9/16" is on a ruler.. :(

gunnar08 02-12-2010 01:23 PM
Whoa....WAYYYY over my head....curious, if you care to explain...what are you trying to figure out? what kind of math is this. I've been out of school a long time! Donna

Ellie May 02-12-2010 01:32 PM
Quote:
Originally Posted by gunnar08 (Post 3000569)
Whoa....WAYYYY over my head....curious, if you care to explain...what are you trying to figure out? what kind of math is this. I've been out of school a long time! Donna
This problem is from an intermediate algebra book (lowest non-remedial algebra class offered at some colleges).


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