This question already has an answer here:
The linear demand function is $Q_D = a + b(P)$. I understand from this thread that it can be thought of as a simplification/magnification of the overall demand curve.
Is there an equation that represents a demand curve such as the linear equation represents a linear curve?
Are students taught how to find the equation of the actual curve? (or why not) Almost every example I see is finding the linear function.