Question

Given 3 collinear points and 1 other point that is not on the same line, how many lines can be drawn

Answer 1

You can only draw one line containing three collinear points. Indeed, for any two distinct points, there's only one line that passes through both points. 

Of course, there are countless different ways to write the equation of such a line, but if you graph them (or algebraically manipulate the equations), they all turn out to be the same line.