I am just answering for points
Answer:
5 tacos for 2 guests would mean more for each person, while 2 tacos for 5 guests would mean less for each person
The value of p = 11
y = 5x + p
1 = 5(-2) + p
1 = -10 + p
11 = p
X = 13
( x + 4) / 51 = (2x - 7) / 57
585 = 45x
585/45 = 45x/45
x = 13