For the conic section 
in the xy-plane
(a) Use rotation of axes to find the corresponding equation in the XY-plane (clearly state the angle of rotation ).
(b) Sketch the graph in xy-plane.
Definitions:
Monopolist
An individual or firm that is the sole provider of a good or service, possessing significant market power over prices and output.
AC
Average Cost, also referred to as the cost per unit of output, often used interchangeably with Average Total Cost.
Deadweight Loss
The reduction in economic performance that is seen when a good or service fails to achieve the equilibrium in a free market.
Perfectly Competitive Industry
An industry structure characterized by many small firms, homogeneous products, and free entry and exit, leading to price-taking behavior.
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