Hi, quick distance between points ?

Hello everyone! I can't believe I actually found a forum for math! Mathletes unite, Well it's my last class to finish up my degree and I can't believe I waited till last minute to take it! now its beating me up!

I have a few questions, but will post one at a time in this thread so I can work them out to to understand them, thank you. The first one is

**Find the coordinates of the other endpoint of the segment, given its midpoint and one endpoint. (Hint: let (x,y) be the unknown endpoint. Apply the midpoint formula, and solve the 2 equations for x and y.)

Midpoint (27,1), endpoint (19,-1)

thank you so much its due before midnight!!