How do you factorise a linear?

Answer 1

A linear expression can only have a numeric factor that can be "taken out".

The expression will be of the form ax + b where a and b are numbers that have k as their highest common factor (HCF).

That is, a = k*c

and b = k*d

Than being the case, ax + b = kcx + kd = k*(cx + d)