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-   -   True or false (https://www.askmehelpdesk.com/showthread.php?t=759589)

  • Jul 23, 2013, 02:20 PM
    Tumandygram11
    True or false
    The ordered pair (3,-2) is a solution to the system of inequalities, Y< x -3, Y> -x -2
  • Jul 23, 2013, 06:26 PM
    Enigma1999
    We can't give you the answer, but we can help you. Did you plug in your x and y value? If so, what do you come up with?
  • Jul 23, 2013, 07:07 PM
    1102568
    -2<3-3, -2>-3--2 The second half of the equation is wrong if y=-2. -3 takeaway -2 means -3 + 2, which equals -1. -2 is not bigger than -1 it is smaller than.

    So the answer is false.
  • Jul 23, 2013, 07:17 PM
    Enigma1999
    That's what I got.
  • Jul 24, 2013, 12:42 AM
    Alty
    Please see the rules concerning homework help on this site:

    Ask Me Help Desk - Announcements in Forum : Homework Help
  • Jul 24, 2013, 05:45 AM
    ebaines
    Quote:

    Originally Posted by Tumandygram11
    The ordered pair (3,-2) is a solution to the system of inequalities, Y< x -3, Y> -x -2

    Quote:

    Originally Posted by 1102568
    -3 takeaway -2 means -3 + 2, which equals -1. -2 is not bigger than -1 it is smaller than.

    So the answer is false.

    I disagree. In the original post the OP wrote that the second inequality to evaluate is: Y > -x - 2. But here you are using Y > -x -(-2). Check your minus signs!
  • Jul 24, 2013, 08:57 AM
    Enigma1999
    Quote:

    Originally Posted by ebaines View Post
    I disagree. In the original post the OP wrote that the second inequality to evaluate is: Y > -x - 2. But here you are using Y > -x -(-2). Check your minus signs!

    2 negatives become a positive, right? I come up with -1 on the second part as well. -2 is not greater than -1, so the answer would be false, right? Unless I am missing a step, which I could be. It has been a while.
  • Jul 24, 2013, 09:06 AM
    ebaines
    My point was that given Y> -x-2, if you substitiue -2 for Y and +3 for x and you get:

    -2 > -(3)-2, or

    -2 > -5

    which is true.
  • Jul 24, 2013, 09:21 AM
    Enigma1999
    Quote:

    Originally Posted by ebaines View Post
    My point was that given Y> -x-2, if you substitiue -2 for Y and +3 for x and you get:

    -2 > -(3)-2, or

    -2 > -5

    which is true.

    Ahh yes I see what my mistake was.

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