Results 1 to 3 of 3

Math Help - can someone check my math please?

  1. #1
    ixi
    ixi is offline
    Newbie
    Joined
    Oct 2007
    Posts
    15

    can someone check my math please?

    i have 3 equations and i have to solve for a,b,c

    the equations:
    a=4.3-0.056b-51.2c
    b=20.76-51.2a-4130.1c
    c=0.352-0.055a-0.009b

    i got
    a=3.47
    b=42.3
    c=-0.003

    it would be great if someone could just double check my work. thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Forum Admin topsquark's Avatar
    Joined
    Jan 2006
    From
    Wellsville, NY
    Posts
    9,668
    Thanks
    298
    Awards
    1
    Quote Originally Posted by ixi View Post
    i have 3 equations and i have to solve for a,b,c

    the equations:
    a=4.3-0.056b-51.2c
    b=20.76-51.2a-4130.1c
    c=0.352-0.055a-0.009b

    i got
    a=3.47
    b=42.3
    c=-0.003

    it would be great if someone could just double check my work. thanks
    You can double-check your own work just by plugging the values back into your equations. However the first equation fails miserably.

    What method are you expected to use to solve this?

    -Dan
    Follow Math Help Forum on Facebook and Google+

  3. #3
    ixi
    ixi is offline
    Newbie
    Joined
    Oct 2007
    Posts
    15
    there's no required method. we're just suppose to solve for the letters.

    i took the equation of b and plugged it into a
    and got a=3.92+15.11c

    then i plugged that equation into c
    and got b=15.2-1034.4c

    then plugged that one onto equation b and got b=6.9-3606.2c

    then using the two b equations:
    b=15.2-1034.4c
    b=6.9-3606.2c
    got c= -0.003

    since a=3.92+15.11c
    and c= -0.003
    a= 3.47

    then b=42.3

    i guess i made a calculation mistake somewhere. i'll go back and redo it.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Check math and help w/ Expected Value
    Posted in the Statistics Forum
    Replies: 9
    Last Post: June 3rd 2010, 07:13 PM
  2. check my math
    Posted in the Algebra Forum
    Replies: 3
    Last Post: September 8th 2009, 09:15 PM
  3. Please check my work. :D discrete math
    Posted in the Discrete Math Forum
    Replies: 2
    Last Post: July 16th 2009, 05:32 PM
  4. check my work- simple math
    Posted in the Pre-Calculus Forum
    Replies: 6
    Last Post: June 1st 2008, 10:38 AM
  5. math/check+ help! conic in standard form
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: December 5th 2006, 12:44 PM

Search Tags


/mathhelpforum @mathhelpforum