Part 3 RATE OF CHANGE and SLOPE (m) a) Every time you use 1 more minute of talk time, how much does that cost? b)So, why is your rate of change(change in cost/change in minutes talked) 2. Intial vaule and y-intercept a)how much does your plan cost even if you don’t use any minutes? b)So what is your intial value (b)? 3.Equation of the line(y=mx+b) a)Knowing the value of m and b you found above, write the equation of your line: