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mathpupilon How to Tell a Mathematician You Love Them (2017)

For the math geeks out here, can someone help me out with these two equations for Valentine heart - https://news.ycombinator.com/item?id=22317969?

mathpupilon How to Plot Valentine Heart with Python and Matplotlib

That was fun! Liked the bit about XKCD plots too. The two equations used are:

y1 = sqrt(1 - |x|) * sqrt(|x|)

y2 = (-3/2) * sqrt(1 - sqrt(x))

Can someone explain me how to find these equations? I would like to use these equations but it would be good to know what they mean before I use them. :-)