Let x = number of student tickets sold.
Let y = number of adult tickets sold.
we cannot sell a negative number of tickets
therefore, x and y values have to be ≥ 0. T
he value of all the student tickets is 1x since they are $1 each
the value of all the adult tickets is 2y because they are $2 each.
Therefore their total value have to be at least $250 which will be writtenas
1x + 2y ≥ 250.