The regular price of a n nec klace is $36.95. during a sale the watch was marked 15%

Can someone explain the elimination method to me for this problem?

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 the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?