Math

posted by Kathrin

-8x > -64

A little confused on how this is done.

  1. Ms. Sue

    -8x > -64

    Divide both sides by -8. Turn the sign around because you're dividing by a negative number.

    x < 8

  2. Steve

    one way is to remember to change direction when multiplying/dividing by negative values. So,

    -8x > -64
    x < 8

    This is just a shortcut to doing the addition/subtraction to swap sides:

    -8x > -64
    add 8x:
    0 > 8x-64
    add 64:
    64 > 8x
    8 > x

    no change of direction needed here, but the 8x still winds up on the proper side of the arrow

  3. Kathrin

    Thank you so much!

  4. Ms. Sue

    You're very welcome.

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