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xx-2x+1+yy     =aa/mm
xx+2x+1+yy     =cc/mm
xx     +yy-2y+1=bb/mm
xx     +yy+2y+1=dd/mm

Let k=y/x=(h4^2-h2^2)/(h3^2-h1^2) (from above)
Let n=x*m*m=(h3^2-h1^2)/4         (from above)
...
x2=(b-sqrt(b^2-4a))/2a
y1=k*x1
y2=k*x2