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why do oyu change the last two signs when subtracting two negative numbers?

  • math -

    If you add a negative number to something you go left on the number line (minus direction).
    5 + (-4) = 5 - 4 = 1
    Therefore if you subtract a negative number from something, you go right on the number line (plus direction).
    5 - (-4) = 9

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