1. Warm-Up #12 (Monday, 9/28) Simplify 3(x+y) +5x -7
Simplify 3(yx+6) +xy +6
Evaluate 5x +6 -x given x= -3

2. Homework (Monday, 9/28)
Lesson 2.07 packet

3. Lesson 2.07 Reversing Operations

4. Method for performing food backtracking steps
Make a list of steps, in order, that show how to get form the input variable to the output. You can build a machine diagram or a flowchart to show your steps.
Make a list that reverse the order of steps in the first list and shows how to undo each operation. (addition and subtraction undo each other; multiplication and division undo each other)
Start with the output. Perform each step on the list of reverse steps to find the value of the input variable.

5. Identify which expression is Reversible or Irreversible
What is the square root of 25
6+y2

6. Interpreting phrases into algebraic expression
Mary takes a number, multiplies it by 3, adds 4, and then subtracts 6. The final answer is 10. What is her number?
Kevin takes a number, multiplies it by 12, and then subtracts 9. The final result is -5. What is his number?

7. Activity You will write down two word problem expressions
Your partner will write the expression as a statement of operations, decides if the operations are reversible, and describes the operations that reverse them.