My Math Forum Year 11 algebra

 Algebra Pre-Algebra and Basic Algebra Math Forum

 January 12th, 2016, 06:24 PM #1 Newbie   Joined: Jan 2016 From: Auckland Posts: 2 Thanks: 0 Year 11 algebra x + 2y = 4 2x + 3y = 10 I am really stuck! Last edited by skipjack; January 13th, 2016 at 04:58 AM.
 January 12th, 2016, 06:34 PM #2 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,881 Thanks: 1088 Math Focus: Elementary mathematics and beyond Multiply the first equation by 2 and subtract the second equation from the result. That gives you y and x should be easy to find from there.
 January 12th, 2016, 06:35 PM #3 Newbie   Joined: Jan 2016 From: Auckland Posts: 2 Thanks: 0 When you mean multiply, do you also mutiply the answer of the 1st equation aswell?
 January 12th, 2016, 06:59 PM #4 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,881 Thanks: 1088 Math Focus: Elementary mathematics and beyond Yes.
January 12th, 2016, 06:59 PM   #5
Math Team

Joined: Jul 2011
From: Texas

Posts: 2,774
Thanks: 1428

Quote:
 Originally Posted by Fastsad When you mean multiply, do you also mutiply the answer of the 1st equation aswell?
Multiply every term in the 1st equation by 2 ...

2x+4y=8
2x+3y=10

now, subtract each term in the 2nd equation from the 1st

 January 13th, 2016, 02:36 AM #6 Senior Member   Joined: Apr 2014 From: Glasgow Posts: 2,132 Thanks: 717 Math Focus: Physics, mathematical modelling, numerical and computational solutions This is a simultaneous equation that can be solved either by 1. elimination (the methods Skeeter and Greg are suggesting); or 2. substitution I made a post a few days ago here: I have to solve 3 equations with 3 variables and I'm extremely confused that explains both methods. You can also try the link by Denis on that thread.

 Tags algebra, year

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post mathbalarka New Users 13 January 13th, 2014 08:17 AM mathbalarka New Users 6 April 11th, 2013 10:48 PM Jijjin Algebra 1 May 16th, 2007 08:01 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top