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    AshleyRae09's Avatar
    AshleyRae09 Posts: 6, Reputation: 1
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    #1

    Sep 25, 2009, 07:31 PM
    solve the solution
    how do you solve for the solution
    x+9y=2(1)
    x=9-y(2)
    ohsohappy's Avatar
    ohsohappy Posts: 1,564, Reputation: 314
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    #2

    Sep 25, 2009, 07:34 PM

    What level of math is this?
    AshleyRae09's Avatar
    AshleyRae09 Posts: 6, Reputation: 1
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    #3

    Sep 25, 2009, 07:35 PM
    Its algebra in college
    ohsohappy's Avatar
    ohsohappy Posts: 1,564, Reputation: 314
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    #4

    Sep 25, 2009, 07:38 PM

    Haa crap once sec, I'll ask my boyfriend. Tutors Calculus ane linear Algebra. So he's a smarty pants.
    AshleyRae09's Avatar
    AshleyRae09 Posts: 6, Reputation: 1
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    #5

    Sep 25, 2009, 07:39 PM
    Thank you because I'm stuck on that one and another one I posted if you could look at that one for me? Thanks
    ohsohappy's Avatar
    ohsohappy Posts: 1,564, Reputation: 314
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    #6

    Sep 25, 2009, 07:40 PM
    Quote Originally Posted by AshleyRae09 View Post
    thank you because im stuck on that one and another one i posted if you could look at that one for me? thanks
    Maybe copy and paste it?
    AshleyRae09's Avatar
    AshleyRae09 Posts: 6, Reputation: 1
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    #7

    Sep 25, 2009, 07:42 PM

    solve with add and multiply 5+6x<53
    ohsohappy's Avatar
    ohsohappy Posts: 1,564, Reputation: 314
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    #8

    Sep 25, 2009, 07:45 PM

    When's it due? Monday? He might be taking his time. I had to text it to him.
    AshleyRae09's Avatar
    AshleyRae09 Posts: 6, Reputation: 1
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    #9

    Sep 25, 2009, 07:54 PM

    Yeah its due Monday
    Thankss
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #10

    Sep 26, 2009, 01:29 AM

    Here, the easiest way to solve it is by substitution.




    The second equation shows you the 'value' of x. So, use that in the first equation.



    Since 'x' is 9-y, replace the value of 'x' like this:



    Did you see it? I replaced the x by its equal value, that is 9-y.

    Now, it's easy to find y.





    - y + 9y gives + 8y



    Now remove 9 from both sides:



    The 9 cancels out on the left hand side:





    Divide both sides by 8:



    The 8 cancel out on the left hand side:





    Here is the value of y.

    Now replace that value in the previous equation,





    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #11

    Sep 26, 2009, 01:36 AM

    Quote Originally Posted by AshleyRae09
    5+6x<53
    This one now.



    Remove 5 from both sides:





    Divide both sides by 6:





    Here it is! :)

    If you were to divide or multiply by a negative number at any time, you will have to change the inequality sign. '>' becomes '<' and vice versa.

    I'll give you an example:

    Let's say

    That's true right?

    Ok, let's multiply that by -2:





    Is -10 really smaller than -12? No. If you plot these on a number line, -10 is larger than -12. So, when you multiply or divide by a negative number, always invert the inequality sign.

    I hope it helped! :)

    If you have more problems, don't hesitate to ask. Next time though, post what you did and got wrong, so that we know where the problem is. :)
    ohsohappy's Avatar
    ohsohappy Posts: 1,564, Reputation: 314
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    #12

    Sep 26, 2009, 08:15 AM

    HAHAHA OH GOSH! WHY didn't I think of that. I must have been tired last night, I could have doen that easily. :)

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