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Math Help - stuck on an inequality problem

  1. #1
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    stuck on an inequality problem

    I am able to solve regular inequalities but not this type

    2x+1 < 5x-8
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  2. #2
    MHF Contributor Siron's Avatar
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    Re: stuck on an inequality problem

    What have you tried?
    Put all the constant numbers to one side and also all the variables to one side. Can you do that?
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  3. #3
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    Re: stuck on an inequality problem

    so 7x+7=0?

    or

    2x+1-5-8=0

    I tried both and still get stuck
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  4. #4
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    Re: stuck on an inequality problem

    Quote Originally Posted by GaDoomZ View Post
    I am able to solve regular inequalities but not this type

    2x+1 < 5x-8
    Step #1

    1<3x-8.

    Carry on!
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  5. #5
    Junior Member freestar's Avatar
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    Re: stuck on an inequality problem

    Approach inequalities like a regular equation. The only thing you Must keep in mind is to flip the sign whenever you divide by a negative number.

    Here's an example:

    -1-5x < -3x + 7
    -2x < 8
    divide both sides by -2, therefore sign flips.
    x > -4

    Hope it helped.
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  6. #6
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    Re: stuck on an inequality problem

    Quote Originally Posted by GaDoomZ View Post
    so 7x+7=0?

    or

    2x+1-5-8=0

    I tried both and still get stuck
    Because you have not taken the correct steps.

    2x+1<5x-8

    Add 8 to both sides, the left is still less than the right
    since 3<7, therefore 3+8<7+8 for example.

    2x+1+8<5x+8-8

    2x+9<5x

    5x>2x+9

    Now subtract 2x from both sides.
    This gets you to what is probably quite familiar to you.
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