Algebra

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A positive integer minus a positive integer is always positive.
This statement is sometimes true. For example, 17 – 5 = 12, but 15 – 20 = –5.

post five other statements about the addition and subtraction of positive and negative integers, and ask whether each is always true, sometimes true, or never true.

  • Algebra -

    If only two numbers are involved,
    Let A and B be real, non-zero numbers.

    1) (+)A + (+)B = (+) ?
    This is always true.

    2) (-)A + (-)B = (-) ?
    This is always true.

    3) (+)A - (-)B = (+) ?
    This is always true.

    4) (-)A - (+)B = (-) ?
    This is always true.

    5) (-)A - (-)B = (+) ?
    This is not always true. For instance,
    -5 - (-3) = -2, but -3 - (-5) = +2.


    Hope this helps~ :3

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