We started by looking at problems with sets of equations.
The first were sets of linear equations.
Others had quadratics. For one problem, if you recognized part of the equation was a perfect square, it made the problem easier.
Other times a single mistake like reversing a negative sign could cause problems later on, especially if done early on that means redoing a lot of work.
After the winter break he was a little rusty with a few things.
It’s important to be able to recognize the equations of parabolas, ellipses, and hyperbolas. If you know what something is, you can look up equations for it more easily.