Six less than twice a number is at least -1 and at most 1

Discussion in 'Calculator Requests' started by math_celebrity, Sep 11, 2016.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    First, the phrase a number means we choose an arbitrary variable, let's call it x.

    Twice a number means we multiply it by 2.

    Six less than that means we subtract 6
    2x - 6

    Now, the last piece, we set up an inequality. At least -1 means greater than or equal to 1. At most 1 means less than or equal to 1. Notice, for both points, we include the number.

    -1 <= 2x - 6 <= 1

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