Eric purchased a transit card to commute to his job at an electronics store. The
function y=-2.50x + 60 models the
amount of credit, y, on Eric's card. x
represents the number of times Eric rides
the local train.
Part A: What does the slope of the
function's graph represent? What does
the y-intercept of the function's graph
represent? Explain your reasoning.
Part B: Eric refills his transit card when he
has $30 or less on it. How many times
does Eric ride the train before he refills
his card? Explain your reasoning.