Math (88 points by the way)

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets,x, and the number of student tickets,y. find the solution and explain what it means. i'll you if you me

If 25% of y is 30, what is 60% of y?

What is the slope of the line that contains the points (-2,1) and (0,-3)