Hello everyone

I am facing the following geometry problem, and since am not so good at it, i would ask your help:

We have a straight line that goes throw 3 points, A(X1,Y1) B(X2,Y2) and M(X0,Y0).

We know X1,Y1,X2,Y2 and we know d, the distance between A and M, and we have to define the two possible positions of the pair X0,Y0...

Any Help would be highly appreciated, and thanks in advance...