Results 1 to 3 of 3

Math Help - Linear systems

  1. #1
    Newbie
    Joined
    Sep 2012
    From
    England
    Posts
    10

    Linear systems

    so this is the question....

    x^2 +y^2=4
    y=2x-5

    how do i do this???? (show full steps please)
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78

    Re: Linear systems

    Quote Originally Posted by cheers View Post
    so this is the question....

    x^2 +y^2=4
    y=2x-5

    how do i do this???? (show full steps please)
    First this is not a linear system. It can be solved by substition

    x^2+(2x-5)^2=4

    This is a quadratic equation. Expand out the parenthesis and sput into standard form and solve.

    Post back if you get stuck.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,045
    Thanks
    886

    Re: Linear systems

    Quote Originally Posted by cheers View Post
    so this is the question....

    x^2 +y^2=4
    y=2x-5

    how do i do this???? (show full steps please)
    substitute (2x-5) for y in the circle equation ...

    x^2 + (2x-5)^2 = 4

    solve for x , then find y using the linear equation

    note you may get more than one solution for x
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. non linear systems
    Posted in the Differential Equations Forum
    Replies: 1
    Last Post: June 3rd 2011, 04:14 AM
  2. Replies: 0
    Last Post: February 13th 2011, 12:40 PM
  3. Linear systems?
    Posted in the Algebra Forum
    Replies: 3
    Last Post: December 14th 2009, 03:24 PM
  4. Replies: 7
    Last Post: August 30th 2009, 11:03 AM
  5. linear systems help
    Posted in the Advanced Algebra Forum
    Replies: 6
    Last Post: August 24th 2009, 01:55 PM

Search Tags


/mathhelpforum @mathhelpforum