1. Do Now
Evaluate 9h + h if h = 2.1
Evaluate 2
(4 + g) 2
If g = 6

2. Learn to solve equations using the inverse operation
Chapter 1 Lesson 5
Algebra: Equations
Objective:
Learn to solve equations using the inverse operation

3. A branch of mathematics that involves expressions with variables.
Lets Review!!
Algebra
A branch of mathematics that involves expressions with variables.

4. Algebraic Expression
A sentence that contains variables, numbers, and at least one operation.

5. Usually a letter or a symbol to represent a number
Variable
A place holder
Usually a letter or a symbol to represent a number

6. A mathematical sentence that contains an equal sign.
Equation
A mathematical sentence that contains an equal sign.
The equals sign tells you that the expression on the left is equivalent to the expression on the right.
Remember that one side must equal the other side.
What ever you do to one side of the equation you must do to the other.
Point out that there are two sides to every equations
4 + 3 = 8 – 1 3(4) = 24 ÷ =

7. The process of finding a solution
Solving an equation
The process of finding a solution

8. A number that makes a sentence true.
Solution
A number that makes a sentence true.

9. To solve equations we will be using the inverse operation.

10. Operations that “undo” other operations The opposite operation
Inverse operation
Operations that “undo” other operations
The opposite operation
Multiplication
Division
Addition
Subtraction
Division
Multiplication
Subtraction
Addition

11. W + 6 = 18 Steps Divide the equation into two parts
Isolate the variable by using the inverse operation
Solve both sides of the equation
Check
W + 6 = 18

12. P– 5 = 20 K + 20 = 43 Steps Divide the equation into two parts
Isolate the variable by using the inverse operation
Solve both sides of the equation
Check
P– 5 = K + 20 = 43

13. S – 34 = 67 Steps Divide the equation into two parts
Isolate the variable by using the inverse operation
Solve both sides of the equation
Check

14. 7t = 77 Steps Divide the equation into two parts
Isolate the variable by using the inverse operation
Solve both sides of the equation
Check

15. 3d = 99 Steps Divide the equation into two parts
Isolate the variable by using the inverse operation
Solve both sides of the equation
Check

16. U 14 16 = Steps Divide the equation into two parts
Isolate the variable by using the inverse operation
Solve both sides of the equation
Check
16 =
U 14

17. Z 7 = 12 Steps Divide the equation into two parts
Isolate the variable by using the inverse operation
Solve both sides of the equation
Check
Z 7
= 12

18. What are the 4 steps in solving equations?
Lets Review
What are the 4 steps in solving equations?

19. Do numbers 14-19 on page 26 in your textbook

20. Take out homework and circle the following numbers: 1-10