Algebra 2 HW help! D:

• Tatsu wrote on 2011-01-28 02:27
  I prefer using Cramer's rule for these...
  
  This is covered in Algebra 2, but more as a quick review before you go onto other stuff involved with I forgot what these are called. It shows up in Algebra 1, but I don't think it appeared in pre-algebra.
• Bakuryu wrote on 2011-01-28 02:32
  This is easy stuff Xiya.
  
  If you truly want to learn instead of us doing your homework, I recommend Khan Academy
  http://www.khanacademy.org/?video=introduction-to-logarithms#Pre-algebra
  
  This guy has helped me on my College tests immensely, just watch and learn.
  
  And you can also use WolframAlpha to corroborate solutions For example, second system results.
  But don't just use WolframAlpha to get solutions (either way I'm guessing your teacher will want to see how you actually solved the equation) But it's a great way to see if you got anything wrong, so you can go back on the paper and find your error, that's how you learn, fixing your mistakes.
• Kueh wrote on 2011-01-28 02:33

  Quote from Shirayuki;3074441:

  
  x+y=4
  -[x-2y=1]
  y=-3
  x-2(3)=1
  x=5
  

  
  
  Fixed it for you.
  
  (Also, I apparently can't do math at all unless I see it.)
• chaolin wrote on 2011-01-28 20:58

  Quote from Tatsu;307464:

  I prefer using Cramer's rule for these...
  
  This is covered in Algebra 2, but more as a quick review before you go onto other stuff involved with I forgot what these are called. It shows up in Algebra 1, but I don't think it appeared in pre-algebra.

  
  
  Wait... Cramer's rule? As in this one?
  
  http://en.wikipedia.org/wiki/Cramer%27s_rule
  
  Last I checked that was stuff you learn in Linear Algebra, not Algebra II....
  
  Edit to the OP: Well, if you do want to use Cramer's Rule, then just plug your equations into a matrix and put it into row reduced form. Done.
• Hebban wrote on 2011-01-29 13:38
  What. Why are you 18 and have homework that people in middleschool get.