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Any math experts out there? I need help badly!! please? :(

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posted on Aug, 17 2012 @ 09:02 PM
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I can NOT get this answer no matter what I do. And it's irking me.

If anyone knows the answer, I'll love you for life and beyond. seriously.

Solve via the elimination method:

4x=18+2y
-6/5x + y=7/5

that's negative six over 5 with an x next to the fraction. Not 6x or 5x. It's 'fraction x" if you will.

thanks SO much for the help. We need minimum 80% to pass all homework, quizzes, pre tests, tests, pre finals, finals etc. or we can NOT move on.

The answer would be golden. I got (13,17) as the solution set, but we also can have 'infinitely many solutions' or 'the solution is the empty set' for the answer too.




posted on Aug, 17 2012 @ 09:19 PM
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reply to post by sarra1833
 


work:
solve for y
4x=18 +2y
4x -18=2y
2x - 9 =y

insert y to formula
-6/5x + y =7/5
-6/5x + (2x - 9)=7/5
-(6/5x)5 + (2x-9)5=(7/5)5
-6x+10x-45=7
-6x+10x=52
4x=52
x=13

2x-9=y
2(13)-9=y
26-9=y
17=y





edit on 17-8-2012 by pointr97 because: (no reason given)

edit on 17-8-2012 by pointr97 because: (no reason given)

edit on 17-8-2012 by pointr97 because: (no reason given)

edit on 17-8-2012 by pointr97 because: (no reason given)



posted on Aug, 17 2012 @ 09:27 PM
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x = y/2 + 9/2

x = - 5y/6 - 7/6
edit on 17-8-2012 by Manhater because: (no reason given)



posted on Aug, 17 2012 @ 09:32 PM
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Yes you are right, x=13 y=17

I don't know what the above poster was doing.

P



posted on Aug, 17 2012 @ 09:34 PM
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I'm too tired to explain it right now. I was solving for X in fraction form.



posted on Aug, 17 2012 @ 09:40 PM
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Originally posted by pheonix358
Yes you are right, x=13 y=17

I don't know what the above poster was doing.

P


sorry, bit rusty, corrected work.



posted on Aug, 17 2012 @ 09:41 PM
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I get:

x = 13
y = 17

Isolate for x:

x = (9 + y) / 2

Substitute expression for x into other equation and solve first-order equation for y.



posted on Aug, 17 2012 @ 09:42 PM
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reply to post by Manhater
 


Soz, we posted at the same time. I was referring to post no. 2.

4x = 18+2y simplified for y is
2x-9 = y

-6/5x+y=7/5 simplified for y is
y=7/5+6/5x

Therefore

2x-9 = 7/5 + 6/5x solve for x

x=13

to solve for y

4x=18+2y
4*13=18+2y
y=17

As a check, do it all again solving for y in the first instance

P



posted on Aug, 17 2012 @ 09:49 PM
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reply to post by pheonix358
 


I did a quick version.



posted on Aug, 17 2012 @ 10:11 PM
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if you want actual values popping out for x and y you will need to specify one parameter first. Thats simple. Its tough whne you need to solve a solution for x and y in multiple system eg

3X + 8 = 4Y + 3
6Z + 7 = 7Y + 4
5X + 3 = 6Z + 1

Then you need to use mathematic matrices. Good luck!



posted on Aug, 17 2012 @ 10:40 PM
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Love you all. Thank you. I passed with an 81%. Sad crud is, those reviews, the scores do NOT figure into your overall. So they don't count at all, yet you STILL need an 80 or higher to move on. I hate it so much.


If I need help with my test, I'll be sure to post here. You all are amazing



posted on Aug, 17 2012 @ 10:59 PM
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Glad to help!

I was doing this stuff 40 years ago. ROFL

P



posted on Aug, 18 2012 @ 02:25 PM
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reply to post by pheonix358
 


Math is not my subject, nor is it needed for my degree (that i can't pursue after the next 2 classes as loans dried up sadly). Also, we're doing graphs and being online, and being almost 40, my eyes mess up when I try to see the small graphs from the online class. It's horrible xD



posted on Aug, 18 2012 @ 09:36 PM
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Math is not my subject, nor is it needed for my degree (that i can't pursue after the next 2 classes as loans dried up sadly). Also, we're doing graphs and being online, and being almost 40, my eyes mess up when I try to see the small graphs from the online class. It's horrible xD


Math is a left brain function and some people are right brained creative. Mabey its time to explore you creative capabiilities. I suggest go to laura eisnhower cosmi gaia facebook page. You see some really interesting applications of the right brain power going on there.
edit on 18-8-2012 by AthlonSavage because: (no reason given)



posted on Feb, 20 2013 @ 08:41 PM
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reply to post by sarra1833
 


Wanna know how to do this with linear algebra? It's all quite simple once you put thing in terms of 3-space vectors.




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