Rational equations are tricky because you can't divide by zero.
What happens to the graph as you get close to dividing by zero?
What determines the shape and postion of the graph?
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When a quadratic equation is in vertex form it is easy to tell where the vertex of the graph will be and what shape the graph will take.
What is the shape of the graph of a quadratic equaiton?
Where will it appear on the graph?
What does the graph of an absolute value funciton look like?