Question

Points X, Y, Z are collinear such that d(X, Y) = 17, d (Y,Z) = 8 find d(X,Z)​

Answer 1

It depends upon position of Z, if it is betweeen X and Y then answer should be 17-8 =9 and if it is outside of X and Y then answer will be 17+8=25.

Answer 2

As X, Y, Z are collinear points

d(X,Y) = d(X,Y) + d(Y,Z)

Hope it will help you !!