Question #293606

Let 𝑃 be the midpoint of the line segment joining the points 𝐴(𝑎 + 𝑏, 𝑏) and 𝐵(𝑎 − 𝑏, 𝑎 + 𝑏). Find the slope of the line passing through 𝑃 and 𝑄 (𝑏, −𝑎/2) .


1
Expert's answer
2022-02-07T10:17:24-0500

It follows that for the point P(x,y)P(x,y) we have that x=a+b+ab2=a, y=b+a+b2=a2+b.x=\frac{a+b+a-b}2=a,\ y=\frac{b+a+b}2=\frac{a}2+b. Therefore, the slope of the line passing through P(a,a2+b)P(a,\frac{a}2+b) and 𝑄(𝑏,𝑎2)𝑄 (𝑏, −\frac{𝑎}2) is equal to

a2+b(a2)ab=a+bab.\frac{\frac{a}2+b-(-\frac{a}2)}{a-b}=\frac{a+b}{a-b}.


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