Formative Assessment 48

Assessment Problem: 

1. Solve the equation 2x+3=5x−9.
2. After solving, could you solve it in another way?
3. What would be the relationship between the graphs of each side of the equation?

Common Responses: 

The correct answer is {4}, it has a unique solution.
Graphically each side represents a line and the answer represents the intersection of the lines.  89% of high school student-pairs answered this question correctly.  Symbolic manipulation was the first and only choice of solution strategy for this question.

Domain: 
Algebraic Relations
Theme: 
Solving equations
Common Core Standards: 
6.EE Expressions and Equations
Research References: 
(Huntley, Marcus, Kahan, & Miller, 2007)