Solution
x represents the number of student tickets sold and y represents the number of adult tickets sold
For this case we can set up the following inequality for the revenue:
11x + 6y >= 770 (revenue)
6y>= 770-11x
y >= (770-11x)/6
x + y <=100 (number of people)
y <= 100-x
And if we graph this we got:
And one possible feasible solution would be x= 34 and y=66