There is a point $M (2,1$) on a Cartesian coordinate system. There is also a point $P (x,y)$. What is the distance $MP$ in $x$ and $y$?
I can figure out that $ PM^2$ = $(x-2)^2 + (y-1)^2$, at least, I think so, but how to solve $PM$? I am not the biggest fan of algebra so..