Marking ! ..
karen is trying to choose a cellphone plan. company j charges a subscription fee of $30 per month plus $1 per hour of use.
company k charges no monthly fee, but charges $3 for every hour of use. karen made this graph to compare the prices of the two
the lines for company j and company k cross a point.
the coordinate (30,60) is the point at which company j and company k cost the same. what does the point (30,60) mean? (hint: what is being graphed on the x-axis?
what is being graphed on the y-
if karen used her cell phone for less than 30 hours a month, which company should karen choose? why?
if karen uses her cell phone for more than 30 hours a month which company should she use? why?