There is a proportional relationship between the volume of a sample of helium in liters and the mass of that sample in grams . If the mass a sample is grams, its volume is 28 liters. (5, 28) shown on the graph below.

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