How would you graph y- 4x =8 ?

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

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9