Question

Linear pair of angles are always supplementary . but supplementary angles need not to form a linear pair .why?

Answer 1

Linear pair of angles have one arm common but it is not necessary that supplementary angles will have one arm common

Answer 2

linear pair means that there are two angles on a line. the sum of angles on line is 180.
supplementary angles is no. angles on a line
whose sum is 180.
supplementary angle have variable no. of angles whereas linear pair have only two angle.

I hope this will help you