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The question is below:

Given a demand function QD = 17 – 6P, find the elasticity of demand at P = $2. Is the demand elastic or inelastic when P = 2?

Heres what I know: Q = 17 - 6 (2) = 5

δQ/δP = -6

But how do I find εD?

Thanks in advance.

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Please show your work on your attempt thus far otherwise this is likely to be closed as a low quality question. – BKay Apr 12 '15 at 20:53
I figured it out actually: εD = δQ/δP * P / Q = -6 * (2/5) – JDH Apr 12 '15 at 23:48
You can enter and accept your own answer as a resource to the community. – BKay Apr 13 '15 at 0:03

I figured it out. In my solution: $$\epsilon_D = \partial Q / \partial P \cdot P/ Q = -6 * (2/5)$$

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