Now I will spare you the calculus and we'll simply jump to this step. If you're interested about what to do from this step to this step, leave a comment and I'll show you. So after we use calculus, we get natural log of the concentration of final minus natural log of concentration of initial equals negative k times time final minus time initial. Now this time initial is zero. So that becomes zero and we bring over this guy to the right side and we get natural log of the concentration final equals negative k times t final plus because this guy was brought over natural log of the concentration of an initial. Now, this guy also has the same form as the line as a line y equals MX plus B, where this guy is our Y value this guy.