Big Ideas Math: Modeling Real Life, Grade 7
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3. Identifying Proportional Relationships
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Exercise 6 Page 200

Instead of adding a negative number, you can subtract.

-17

Practice makes perfect
Let's perform the addition.
-6+(-11)
-6-11
- 17

We can see that adding a negative number is the same as subtracting its positive counterpart. Below we will demonstrate by finding -6 and moving 11 units to the left on the number line

The resulting position, after moving to the left on the number line, is the sum. -6+(-11) = -17