Quick review: the additive inverse (opposite) of a number is the number that when added with the first, results in zero.  Let's practice!

 

Let's start with simpler problems!
What is the additive inverse of 7?

What is the additive inverse of -3?

What is the opposite of -8?

What is the opposite of 15?

What is the first step when solving:
     x + 8 = 13  ?

What number is the same distance from 0 as is 9?

What number is the same distance from 0 as is -10?

 

Now let's try some harder ones!

Problem

Answer

Explanation needed?

1.)  -9 + x = 19

2.)  y - 9 = 30

3.)   x + (-7)  = 15

4.)  y + (-10) = 3

5.)  19 + y = 5

6.)  -5 + x = -5

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