My Math Forum  

Go Back   My Math Forum > High School Math Forum > Algebra

Algebra Pre-Algebra and Basic Algebra Math Forum


Reply
 
LinkBack Thread Tools Display Modes
August 28th, 2009, 12:16 PM   #1
Senior Member
 
Joined: Jul 2009

Posts: 136
Thanks: 0

simultaneous equations anyone?

OK, I got this one I believe. y/2 - x = 2, 6x - 3y/2 = 3 and I ended up with y = 10, x = 3.

But these two are giving me fits: x/2 - y/5 = 1, y - x/3 = 8. I started by simplifying the y as y = 8 + x/3 and substituting that into the other "y" that would present itself as:

x/2 - 8/5 + x/3/5 = 1. The "x/3/5" should be read as x/3 as the numerator and 5 as the denominator.

So I suppose I need to know if that is correct as a start. Let me know, thanks! IF you can go further with it, then that would be great.
empiricus is offline  
 
August 28th, 2009, 12:57 PM   #2
Global Moderator
 
greg1313's Avatar
 
Joined: Oct 2008
From: London, Ontario, Canada - The Forest City

Posts: 7,540
Thanks: 920

Math Focus: Elementary mathematics and beyond
Re: simultaneous equations anyone?

I did it this way:

x/2 - y/5 = 1, y - x/3 = 8 ? 10(x/2 - y/5) = 10, 3(y - x/3) = 24 ? 5x - 2y = 10, 3y - x = 24 . . . . and so on . . . .
greg1313 is offline  
August 28th, 2009, 04:34 PM   #3
Senior Member
 
Joined: Apr 2007

Posts: 2,140
Thanks: 0

Since is equivalent to saying that , and is equivalent to saying that since is obvious, the equation is true, and solving the equation gives us and we will use this value to determine the obvious of
johnny is offline  
August 30th, 2009, 04:25 AM   #4
Senior Member
 
Joined: Jul 2009

Posts: 136
Thanks: 0

Re: simultaneous equations anyone?

Thanks everyone! Wouldn't you know that the very next day I got it! y = 8 + x/3 as noted earlier and then I followed it up by simplifying:

5x/10 - 16 - 2x/3 /10 = 1...

5x - 16 - 2x/3 = 10...

15x/3 - 16 - 2x/3 = 10...

15x/3 - 2x/3 = 26...

13x/3 = 26...

13x = 78...

x = 6...

I appreciate your help and assistance.... Have been enjoying the problems!
empiricus is offline  
August 30th, 2009, 04:28 AM   #5
Senior Member
 
Joined: Apr 2007

Posts: 2,140
Thanks: 0

IMO, equations are fun to study!
johnny is offline  
Reply

  My Math Forum > High School Math Forum > Algebra

Tags
equations, simultaneous



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
simultaneous log equations dralay Algebra 3 July 25th, 2013 02:47 AM
Simultaneous Equations bilano99 Algebra 3 June 30th, 2012 05:48 AM
Simultaneous Equations poochie03 Algebra 2 November 6th, 2011 03:35 AM
Simultaneous Equations prashantakerkar Algebra 5 August 29th, 2011 04:16 AM
Simultaneous equations MathematicallyObtuse Algebra 1 November 29th, 2010 05:08 AM





Copyright © 2017 My Math Forum. All rights reserved.