Tuesday, March 25, 2008

More examples of using substitution to solve linear systems

Math Scholars, we are fortunate once again to have some some student work to post to the blog. In this post, you will see that it is not necessary to have both equations in a system in slope intercept form (y=mx+b) to use substitution.

Notice that in example (a), (2x-6) is substituted in for 'y' in the first equation. This allows us to solve for x. Once 'x' is found to be zero, we substitute zero back in for 'x' and solve for 'y'. What a beautiful thing, eh?

If you find that you are still having trouble, please ask me questions in class. There still isn't a better place to get help. :-)