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{{ printedBook.courseTrack.name }} {{ printedBook.name }} To understand Ron-Jon's equation, let's recall the slope-intercept form. $y=mx+b$ We can see that Ron-Jon's equation is in slope-intercept form. $y=x−30$ Now, let's write our own equation of the problem and compare it with Ron-Jon's. We are told that Lena-Jon starts counting the days left when it's $30$ days left. Thus, the $y$-intercept $b$ can be interpret as $(0,30).$ $b=30$ Since the days left decrease by one each day, the slope $m$ should be $-1.$ Thus, this gives us the equation $y=-x+30.$ Hence, Ron-Jon mixed up the slope and $y$-intercept.