Use the value of the ratio to determine which ratios are equivalent to 7: 15 a) 21: 45 b) 14: 45 c) 3: 5 d) 63: 135

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126