19. the arlington drama club is selling tickets to an upcoming play. they can sell at most 250 tickets. the adult
tickets sell for $15 each and student tickets cost $5 each. they would like to raise at least s2000. ifx represents
the number of adult tickets and y represents the number of student tickets, answer the following

a) write a system of inequalities that models this situation.

b) if half the tickets are sold to students, could this solve the system that you created? justify your answer.

linear pair postulates

let's cover over the formula of the vertex:

y = a(x – h)^2 + k

in this formula, (h,k) are the vertex, always remember that the positive or negative value of the vertex is based on the sign it has.

for example, if the vertex is -3,-6 then both the x and y value would have the positive sign attached to it and if it were a positive x and y value, then a negative sign would be attached to it.

with that being said, for our problem the x value is a positive one so we are looking for a number with a negative sign next to it, in this case the first and second choice.

however, for the first answer choice it isn't quite part of the formula so we know that the answer choice correctly displays the x value.

to confirm, we can see if the -1 fits correctly with the second answer choice, and as mentioned above a negative number will have a positive sign attached to it. so, for our problem we can see that -1 has been changed to +1, so we can confirm that the second answer choice is correct.

hence, our final answer is y=(x - 1)^2 + 1