2/7x+1 7=-5/7 ill give extra point

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

Does the point (1, sqrt 7) lie on circle shown.

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top