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Trying to figure out the price elasticity of demand

Price elasticity of demand is defined as: $$e=\frac{dQ}{dP} \frac{P}{Q}$$ For demand curve $y=x^{-b}$ elasticity of demand is given by $$e=-b$$
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An attempt at using a graphing calculator to visualize the price elasticity of demand for a point moving on the demand curve

The formulas are not correct. You do not use constant variable labels which is a problem that can easily lead to mistakes. In your case $a=Q$, you also sometimes use $Q=x$, I will ignore that part as ...
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