Karen is trying to choose a cell phone 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 $2 for every hour of use.
karen made the following graph to compare the prices of the two plans.

the lines for company j and company k cross at 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-axis? )

if karen uses her cell phone for less than 30 minutes a month, which company should karen choose? why?

if karen uses her cell phone for more than 30 minutes a month, which company should karen choose? why?