Helping students gain understanding and self-confidence in algebra.
stapel_eliz wrote:I've never heard of the "comparison" method. How does that work? Can you give an example from your book, or maybe a link? (All I could find is a PDF worksheet that makes it look like "comparison" is just a form of "substitution", where both equations are already solved for one of the variables.)
stapel_eliz wrote:Okay, so your book is using the same definition as the document at the link. It's substitution, but you solve for "y=" or "x=" in both of the equations, instead of just one. Then you set the other side of the two equations equal to each other.
In other words, instead of getting "y=" for one equation and plugging that in for "y" in the other, you get "y=" in both equations, and then plug the other side of the "y=" from the one equation in for "y" in the other.
It's a form of substitution, and it can generate messy fractions more easily than will "regular" substitution.