Phép biến đổi tuyến tính xác định bởi có hạng bằng:
A. 0 B. 1 C. 2 D. 3.
f (x y z)= (x+y-z, x-3y+z, x-y)

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