Categories Reasoning with Equations and Inequalities Solving Linear Equations Solving for “y” Post author By mpershan Post date October 3, 2012 5 Comments on Solving for “y” How did this happen? How might you help? Share this:EmailPrint ← Slopedy Slope Slope → Lines Tangent to a Point 5 replies on “Solving for “y”” Pretty minor error. He just lost track of his negatives. Twice! In the exact same spot! Is it a minor error or is it something else? I like that the student knew how to solve for y, the task given to them. That they couldn’t finish it out may or may not be a different problem. Teacher needs more to determine what was behind the error. What’s behind the error is a confusion between the layout of algebraic work and the algebraic procedure. That they dropped a negative while rewriting -3 to -2 3/3 is a minor error. Putting it on the same line as a “continuation” of the original statement ups the confusion factor significantly. The second line, where -2/3 is rewritten into 2/3 suggests that the student is treating that second equals sign as a significant part of the equation. Every time I scroll down to write and look back at the problem I’m confused all over again. I would change -3 to its improper fraction (-9/3) to combat this problem. Less confusion when subtracting 2/3. Comments are closed.