MHB What Makes Mexico City's History So Fascinating?

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It might be worth evaluating each line in their vector forms, and then seeing if you can find where they intersect.
 
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I am unable to follow after this
 
Although $\dfrac{x}{1} = \dfrac{y}{2} = \dfrac{z}{3}$ is a line, $3\beta^2x+3(1-2\alpha)y+z=3$ is not. It is a plane.
 

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