Aradio station gave away concert tickets every hour yesterday. at the end of the second hour, the station had 638 tickets left. at the end of the sixth hour, the station had 522 tickets left. write an equation in standard form that expresses the number of tickets left at the radio station, y, as a function of the number of hours past, x. a. 29x - y = -348 b. 29x + y = 348 c. 29x - y = 696 d. 29x + y = 696