Because numbers don't stop. Think of a number (positive or negative) as a point on a number line. You can move to the right by adding to it and to the left by subtracting from it.
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Yes.
That is correct. If you subtract a positive number from a negative number, your result is negative.
depends if the first number is bigger than the second number than it is a negative
A little awkwardly phrased, so I'll answer both ways. To subtract a negative from anything, add its positive. To subtract a positive from a negative, the equation is treated as though you are adding two postives, the result is negative.
always a negative number. just think about going backwards on a number line.