Formative Assessment 136

Assessment Problem: 

Here are two equations:
213x + 476 = 984
213x + 476 + 4 = 984 + 4
•Without solving either equation, what can you say about the answers to these equations?
a) Both answers are the same   b) Both answers are different     c) I can’t tell without doing the math
•Explain your reasoning

Mathematical Issues: 

How does a transformation to both sides of the equation impact the solution?

Algebraic Relations
Common Core Standards: 
Math Flyer would allow for the graphical representation of both systems. It would demonstrate that the solution does not change.
Research References: 
Rittle-Johnson, B., & Star, J. R. (2007).