It’s a system of linear equations that has an intersection point. It may not be exactly at 575, but they do intersect. Solving the equation gives 574.589, depending on how many decimal points you round to. So 575 is accurate enough within integer rounding.
Also -40C / -40F and 575K / 575F is the temperature of the center and edges of a hot pocket.
I hate to be the good time ruiner, but unlike -40, it’s not on the nose.
Still, really cool that it’s as close a conversion as it is.
It’s a system of linear equations that has an intersection point. It may not be exactly at 575, but they do intersect. Solving the equation gives 574.589, depending on how many decimal points you round to. So 575 is accurate enough within integer rounding.