Question

How to solve for y, in a situation like:
1 = (constant - x)^2 + (constant - y)^2

Answer 1

let a = constant #1, b=constant #2
expand the x term:
1=(a-x)^2 + (b-y)^2
1=(a^2-2ax+x^2) + (b-y^2)
(b-y)^2=1-a^2+2ax-x^2
b-y = sqrt (1-a^2+2ax-x^2)
y=b-sqrt (1-a^2+2ax-x^2)