A contractor needs to buy nails to build a house. The nails come in small boxes and large boxes. Each small box has 100 nails and each large box has 350 nails. The
contractor bought a total of 9 boxes that have 2400 nails altogether. Write a system
of equations that could be used to determine the number of small boxes purchased
and the number of large boxes purchased. Define the variables that you use to write
the system.