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

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

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

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

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

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 ÷ 2 17 = 13 + 2 + 2

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

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

To solve equations we will be using the inverse operation.

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

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

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 = 20 K + 20 = 43

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

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

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

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

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

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

Do numbers 14-19 on page 26 in your textbook

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