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Let's say I owe my brother some money (m). As a gift to me, he takes off $2 (Woo Hoo...). Now I owe him $7. How much did I originally owe him?
Since debt is shown with negative numbers, my equation would look like this: m - (-2) = -7
I can change this equation to an addition problem without changing the outcome because subtracting a negative number is the same as adding a positive number.
m + 2 = -7
To solve this, I will need to get m alone on one side of the equal sign. I will do this by subtracting 2 on each side of the equal sign. Now the problem looks like this: m = -9 .
This answer makes sense because if I had originally owed by brother $9 and he took off $2, that means I would only owe him $7.
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