Haley and Nicole stopped at the school bookstore for extra supplies. Haley bought 8 pencils and 3 folders and spent $10.39. Nicole bought 5 pencils and 4 folders and spent $10.51. How much does a folder cost?
1) 8p+3f=$10.39 2) 5p+4f=$10.51 where p represents pencil & f represents folder. multiply the first equation by 5 and the second equation by 8. 40p+15f=$51.95 40p+32f=$84.08 Subtract 17f=$32.13 f=$32.13/17 =$1.89
