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Math Help - Algebraic Sentences Urgant help

  1. #1
    Newbie Megpup's Avatar
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    Algebraic Sentences Urgant help

    Okay I am reading out of my book and it says: Five times a number is 35 greater than twice the oppocite of the number. What is the number.

    I am so cluless and if you have a trick to understanding it please tell me.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Megpup View Post
    Okay I am reading out of my book and it says: Five times a number is 35 greater than twice the oppocite of the number. What is the number.

    I am so cluless and if you have a trick to understanding it please tell me.
    the oppsosite of a number is defined as the number that when added to the original gives zero. in this context, it's just the negative of the number.

    let the number be x

    so 5 times the number is 5x and that is greater than -2x (twice the opposite of x) by 35, so if we add 35 to -2x we get 5x

    so 5x = 35 - 2x
    => 7x = 35 ...........added 2x to both sides, 5x + 2x = 7x
    => x = 35/7 ..........divided both sides by 7
    => x = 5
    Last edited by Jhevon; May 6th 2007 at 02:11 PM.
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  3. #3
    Newbie Megpup's Avatar
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    7?

    How do you get 7 in this problem? And does X equal 1?
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Megpup View Post
    How do you get 7 in this problem? And does X equal 1?
    i modified what i did above. i added 2x to 5x to get 7x

    x cannot be 1, let's check.

    is 5*1 = 35 - 2*1 ....?

    of course not

    x = 5

    since 5*5 = 35 - 2*5 = 35 - 10 = 25
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