What is a positive plus a negative
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Pos. + Neg. = Pos. if |Pos.| > |Neg.|
Example:
10 + (-9) = 1
|10| = 10 > |-9| = 9
Pos. + Neg. = Neg. if |Pos.| < |Neg.|
Example:
10 + (-11) = -1
|10| = 10 < |-11| = 11
Pos. + Neg. = 0 if |Pos.| = |Neg.|
Example:
10 + (-10) = 0
|10| = 10 = |-10|
Neg. + Pos. the same like Pos. + Neg.