1. Lesson 2.4 - Reasoning in Algebra
“The other day I was driving down the road and saw a banana peel…and swerved. Thank you Mario Kart.”

2. Properties
(on theorem sheet)

3. Properties
(on theorem sheet)

4. Justifying Steps Example: Solve for x. JUSTIFY each step.
Statement
Reason
2(x - 3) +12 = 14
Given
2x – = 14
2x + 6 = 14
2x = 8
x = 4 4

5. Justifying Steps Example: Solve for x and justify each step.B A x
Given:
(2x+10) C O
Statement
Reason
x + 2x + 10 = 139
3x + 10 = 139
3x = 129
x = 43

6. Justifying Steps Example: Solve for m and justify each stepZ 2m
5m + 11
Given: XZ = 32
Reason
Statement
XZ = 32
XY + YZ = XZ
2m + 5m + 11 = 32
7m + 11 = 32
7m = 21
m = 3

7. Lesson 2.4 - Reasoning in Algebra
Homework #8
Pg 97 #2-14 even
Pg 105 #1-4, 6-22 even, 28, 29
“The other day I was driving down the road and saw a banana peel…and swerved. Thank you Mario Kart.”