1. x + 4 = -10 x – 14 = -5 y – (-9) = 4 -4w = 16 Bell Ringer
Solve the following:
x + 4 = -10
x – 14 = -5
y – (-9) = 4
-4w = 16

2. Step Equations

3. To Solve an Equation means...
To isolate the variable it must be by it’s lonesome. (Have a coefficient of positive 1)
Ex: x = 5 is solved for x.
y = 2x - 1 is solved for y.

4. Solving Multi-Step Equations
Ex: x + 9 = 6 5

5. To Solve: Undo the operations by working backward.
Ex: x + 9 = 6 5
Ask yourself:
If we knew what x was what is the first thing we would do?
The second thing?
Recall the order of operations as you answer these questions.
dividing by 5
adding 9
To undo these steps, do the opposite operations in opposite order.

6. The DO-UNDO chart
Use a chart as a shortcut to answering the questions.
DO UNDO ÷ ·5
Follow the steps in the ‘undo’ column to isolate the variable.
Ex: x + 9 = 6 5
First subtract 9.
x = 6 - 9
x = -3
Then multiply by 5.
(5) x = -3(5)
x = -15

7. Let’s try another! Ex: d - 2 = 7 3 (3) d - 2 = 7(3) d - 2 = 21 +2 +2
d = 23
Complete the do-undo chart.
DO UNDO ·3 ÷
To solve for d:
First multiply by 3.
Then add 2.

8. Here’s a tricky one!
Remember to always use the sign in front of the number.
DO UNDO ÷
· -7
To solve for a:
First subtract 3.
Then multiply by -7.
Ex: a = -2 7
3 - a = -2
- a = -5
(-7)(- a) = (-5)(-7)
a = 35

9. Try a few on your own. Make a do/undo chart ONLY.
5z + 16 = 51
14n - 8 = 34

10. DO UNDO ·
-8 ÷ 14
DO UNDO ·
÷ 5

11. Try a few on your own. Now solve for each variable.
5z + 16 = 51
14n - 8 = 34

12. DO UNDO ·
-8 ÷ 14
n = 3
DO UNDO ·
÷ 5
z = 7

13. Homework PG. 197 #22-26 even & Pg. 203 #6-28 even
Do & Undo Charts only

14. Next Day Homework PG. 197 #22-26 even & Pg. 203 #6-28 even
Using the Do/Undo Charts Solve the two step equation
Grading Tomorrow
HW PG. 636 #18-24e
Do & Undo and Show Work

15. Go over homework HW PG. 197 #21-26 All
Do & Undo Charts only
In class do these problems to solve, make sure students are writing the steps correctly

24. Homework HW PG. 203 13,14,16-19 Show do undo, show steps and answers
5 pts each
#14 is extra credit

25. Go over Homework HW PG. 203 13,14,16-19 Do in class pg 203 # 21 and 29
Show do undo, show steps and answers
5 pts each
#14 is extra credit
Do in class pg 203 # 21 and 29

32. Go over Homework HW PG. 203 13,14,16-19 Do in class pg 203 # 21 and 29
Show do undo, show steps and answers
5 pts each
#14 is extra credit
Do in class pg 203 # 21 and 29

33. #21

34. #29

35. Review homework for chapter
HW PG. 221
#14-22 even - show steps and answer (no do undo)
# all – show do undo, show steps, and answer
Review homework for chapter

37. Worksheet
Sec 6.1
KEEP WORKSHEET FOR TOMORROW