Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Need help with this simultaneous equation

  1. Nov 2, 2005 #1
    I've got to solver the simultaneous equations
    y = x2 - x - 6
    x - y + 2 = 0

    I've tried it four different times and failed each time. :frown:


    PS. x2 = x squared
  2. jcsd
  3. Nov 2, 2005 #2
    make y the subject of the 2nd one, equate the two, and solve it like a quadratic....?

    ie. x+2=x^2-x-6
  4. Nov 2, 2005 #3


    User Avatar
    Staff Emeritus
    Science Advisor

    From the second equation, y= x+ 2 so the first equation becomes
    x+ 2= x2- x- 6 or x2- 2x- 8= 0.
    Solve that equation. That's easy to factor. Once you have x, put it into y= x+ 2 to find the corresponding y.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Need help with this simultaneous equation
  1. Simultaneous equations (Replies: 8)

  2. Simultaneous Equations (Replies: 21)

  3. Simultaneous equations (Replies: 11)

  4. Simultaneous equations (Replies: 7)