HELP PLEASEE 
 Erica went to the amusement park and purchased tickets. She bought ferris wheel tickets and roller coaster
 tickets. She bought a total of 12 tickets for $36.50. The ferris wheel tickets cost $2.75 each and the roller
 coaster tickets cost $3.25 each. Find the number of ferris wheel tickets and roller coaster tickets that Erica
 bought.
 HELPPP PLEASE