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Could someone please explain this to me; 

(-1) - (-9)

Guest Feb 9, 2018
 #1
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+1

(-1) - (-9)

 

Think of negative numbers as COLD numbers (the freezer has a negative temp)

an positive numbers are HOT numbers.

 

Here you have  a temp of -1  you want to take away some cold (because -9 is a cold number)

 

If you take cold out of a room then the room gets warmer!

 

So take away a negative can replaced by adding.

 

Taking  away some cold air has the same effect as adding some warm air.

 Both times the room gets warmer.   Do you get it?

 

      - - = + + = +

so

(-1)-(-9) = (-1) + (+9) = -1+9 = 8

 

or

(-1)-(-9) = -1 - -9 = -1+9 = 8

Melody  Feb 9, 2018

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