1. Solving Two-Step Equations
Week 1 Day 2
January 7th, 2014

2. Warm-up
Tell me three things that you remember learning last semester.

3. Essential Question: Standard: How do we solve for a variable?
A.REI.3 Solving liner equations in one variable.

4. What is a Two-Step Equation?
An equation written in the form
Ax + B = C

5. Steps for Solving Two-Step Equations
Solve for any Addition or Subtraction on the variable side of equation by “undoing” the operation from both sides of the equation.
Solve any Multiplication or Division from variable side of equation by “undoing” the operation from both sides of the equation.

6. Opposite Operations
Addition 
Subtraction
Multiplication 
Division

7. Ex. 1: Solve 4x – 5 = 11 4x – 5 = 15 +5 +5 (Add 5 to both sides)
4x = 20 (Simplify)
(Divide both sides by 4)
x = 5 (Simplify)

8. Ex. 2: Solve x/3 + 4 = 9 x/3 + 4 = 9 - 4 - 4 (Subt. 4 from both sides)
x/3 = (Simplify)
(x/3)  3 = 5  3 (Mult. by 3 on both sides)
x = (Simplify)

9. Try These Examples 2x – 5 = 17 x/5 – 3 = 8 5n – 2 = 38 r/3 – 6 = 2
Note: This is class work! Please answer all questions and write them on your notes. This must be check off by the teacher before leaving class to get points!
2x – 5 = 17
x/5 – 3 = 8
5n – 2 = 38
r/3 – 6 = 2
*Write out all steps for solving in words!!

10. Homework 3y + 7 = 25 c/7 + 4 = 9 12b + 4 = 28 d/9 + 4 = 5
*Write out all steps for solving in words!!