math
posted by Nicole .
why do oyu change the last two signs when subtracting two negative numbers?

math 
Damon
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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