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Math Help - Two More Questions For The Night.

  1. #1
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    Two More Questions For The Night.

    I've been working on homework just about all afternoon and all night, getting to the point where I need sleep but before that I have questions about two more.. Questions? xD

    -(19 - 3s) - (8s + 1) = 35

    This one is really getting to me.. Since both sides are in parenthesis but I can't really well subtract or add them together. >.<;

    5(x + 3) - 3x = 2(x + 8)
    = 5x + 15 - 3x = 2x + 16

    In this problem I know I need to merge 5x and 3x together to get any further and that is where I have a dilemma. 2x or -8x or neither! ;-;
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  2. #2
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    So for the first one, just distribute in the negatives. So

    -(19 - 3s) would become -19 + 3s

    and - (8s + 1) would become -8s - 1

    the problem is then -19 + 3s - 8s - 1 = 35

    combine like terms and solve

    the second one turns out to have no solution.

    when you simplify both sides it becomes

    2x + 15 = 2x + 16 and no x could make this equal

    in other terms if you subtract the 15 the problem is then

    2x = 2x + 1 so the right side is always 1 higher then the right, so they are not equal
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  3. #3
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    Quote Originally Posted by deltahunter View Post
    So for the first one, just distribute in the negatives. So

    -(19 - 3s) would become -19 + 3s

    and - (8s + 1) would become -8s - 1

    the problem is then -19 + 3s - 8s - 1 = 35

    combine like terms and solve

    the second one turns out to have no solution.

    when you simplify both sides it becomes

    2x + 15 = 2x + 16 and no x could make this equal

    in other terms if you subtract the 15 the problem is then

    2x = 2x + 1 so the right side is always 1 higher then the right, so they are not equal
    -19 + 3s - 8s - 1 = 35
    -19 - 5s - 1 = 35
    5s - 20 = 35
    5s = 55
    s = 11

    Would this be correct following the rules above?
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  4. #4
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    That doesn't seem right though. :< My answer that is, anymore imput?
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  5. #5
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    you could always substitute your answer back in and see if it comes out right

    Quote Originally Posted by Uriah5356 View Post
    -19 + 3s - 8s - 1 = 35
    -19 - 5s - 1 = 35
    5s - 20 = 35
    5s = 55
    s = 11

    Would this be correct following the rules above?
    I see the problem.
    -19 - 5s - 1 = 35
    5s - 20 = 35
    In these two steps you are not carrying the minus sign on the 5s
    So it should be
    -19 - 5s - 1 = 35
    -5s - 20 = 35
    -5s = 55
    s = -11
    Last edited by mr fantastic; March 12th 2009 at 02:46 AM. Reason: Merged posts
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