Let x be the number of regular tickets
Let y be the number of student tickets
At the most, we can seat 200 people (both regular tickets and student tickets holder). So the inequality is given by:

One regular ticket cost $12, so

numbers of regular tickets cost

One student ticket cost $8, so

numbers of student tickets cost

We want to at least get $1000 from the ticket selling, so the inequality is given by:

The constraint is given by simplifying both inequalities to the lowest term
First, we have

⇒ This is already the lowest term
Second, we have

Simplifying this by dividing each term by 4, we have

The two constraining inequalities are:

