Two years after it’s purchase, if Manuel’s gift card is unused, the automatic decrease on the gift card balance is given by the
equation b = 50 - 5m, where m is the number of months beyond two years. Is this model of the siu action linear? If it is, what are the slope and y-intercept?
A. linear: slope = -10, y-intercept = 5
B. linear: slope = -50, y-intercept = 5
C. linear: slope = -5, y-intercept = 50
D. not linear