Valentine’s Day is coming. Go to Wolfram Alpha and input this equation:

(x^2+y^2-1)^3-x^2*y^3=0

You will get this romantic graph:

Click here to see the equation in Wolfram Alpha

If you like this game, here is another equation producing a heart shaped function:

x^2+(3*y/2-(x^2)^(1/3))^2 = 1

This is its graph:

Click here to see the equation in Wolfram Alpha

My favourite is this parametrical equation:

x=16*sin(t)^3, y=13*cos(t)-5*cos(2*t)-2*cos(3*t)-cos(4*t)

See here its cute graph:

Click here to see the equation in Wolfram Alpha