1. Solving Equations Inverse operations

2. INVERSE = Opposite If I am solving an equation using inverses operations, I am solving it using opposite signs. Example: addition and subtraction are opposites. Multiplication and division are opposites.

3. WHEN CAN I USE INVERSE? When I have the following, I can use inverse operations: 9(a)=19 If there is no sign, A(9)=19 it means multiply. The opposite of multiply is divide, so divide the 2 numbers to find the value of the number.

4. When can I use inverse? N ÷ 9= 5 The opposite of divide is multiply, so you will find n by multiplying the two numbers. You can not use the inverse in division if the number comes before the letter like in 9 ÷ n = 45.

5. When Can I Use Inverse? N-3= 9 The opposite of subtract is add, so I will add the 2 numbers to find N. With subtraction, I can only use inverse if the letter comes first. I cannot do 3-n=2 using inverse.

6. When can I use inverse? 9+n=10 or n+9=10 The opposite of add is subtract, so subtract the smallest number from the largest to find your answer.

7. Division If the number comes first in division, I will divide to find my answer. Example 20÷n=5 I will divide to find my answer.

8. Subtraction If the number comes first in subtraction, I will subtract to find the answer. Example: 12-n=3 n=12-3

9. Try some using inverse!!! n-9=10 What is n? 16+n=19 What is n? n÷5=9 What is n? n(5)=45 What is n? 12(n)=3 What is n?

10. Some more Practice 21.2