Tori is comparing two cell phone plans that both have unlimited calls but different price points for text messages. Plan A is a $ 5 flat fee plus an additional 10¢ per text. Plan B, on the other hand, is a $10 flat fee plus an additional 5¢ per text. Which set of equations can be used to find when Plan B would start becoming cheaper?

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,

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