1. Expressions and Equations

2. Lesson Overview
This is an interactive presentation. You will participate in 3 ways:
Follow along taking notes in the handout.
Respond to questions through Socrative where indicated by the symbol. I will be monitoring
your responses.
Discuss ideas with your partner or group when
directed to do so.

3. Lesson Objectives Content Objectives Language Objectives
Student will distinguish between an expression and an equation
Student will demonstrate simplifying an expression and explain steps
Student will demonstrate solving an equation and explain steps
Language Objectives
Student will summarize differences between expression and equation
Student will explain to a partner how to simplify an expression or solve an equation

4. Let’s start with a puzzle
Pick a number between 1 and 10
Add 3 to the number
Multiply the result by 3
Subtract the original number
Add 2 to the result
Subtract the original number again
Subtract 1 from the result
What number did you end with?
Enter your answer in Socrative. Then share your answer and your original number with your group. How did this happen? We’ll find out at the end of class.

5. Khan Academy
Variables
Expressions
Equations

6. Expressions and Equations
An expression is like a
phrase (part of a sentence).
You simplify an expression.
An expression has no relation symbol.
An equation is like a sentence.
You solve an equation.
An equation has a relation symbol.
Type in an example of a relation symbol.

7. Expression or Equation?
For each question, enter “True” if it is an equation then discuss why with your group and record it on your handout.
x x + 7
x - 2 = 5
9 + x - 2y + 3
2x - 10

8. Steps to simplify expressions and solve equations

9. Right and Wrong
What was done right and wrong here? Talk with your group and make notes on your handout
What was done right and wrong here? Talk with your group and make notes on your handout

10. Now your try some
Show your work and write your answer on your handout.
Type your answer into Socrative.
4d + 6 = 38
17 = 7x + 3
3h - 11 = 25
5t - 6 = 34
10 + 5y = 25
34 = 4p - 10

11. Let’s explore our puzzle
Words Math
Pick a number between 1 and x
Add 3 to the number x + 3
Multiply the result by (x + 3)
Subtract the original number (x + 3) - x
Add 2 to the result (x + 3) - x + 2
Subtract the original number again (x + 3) - x x
Subtract 1 from the result (x + 3) - x x - 1
Subtract the original number again 3(x + 3) - x x x
Using what we’ve learned about simplifying expressions, what do you get when you simplify this?
3x x x x
(3x - x - x - x) + ( )
0x + 10
What does this mean? No matter what x is, you always get 10