What is the constant of variation, k,of the direct variation, y=kx, through (5,8)

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

Can someone me out here and the tell me the greatest common factor

Asinusoidal function whose frequency is 1/6pi