Troy and Lisa were shopping for school supplies. Each purcahsed different quantities of the same notebook and thumb drive. Troy bought five notebooks and four thumb drives for $83. Lisa bought six notebooks and six thumb drives for $120. Find the cost of each notebook and each thumb drive.

Answer 1

5n + 4t = 83

6n + 6t = 120 ... n + t = 20 ... 4n + 4t = 80

subtracting equations ... n = 3

substitute back to find t