1. A company the manufactures aquariums has a fixed cost of $118,000. It cost $140 to produce each aquarium. The selling price is $360 per aquarium. How many aquariums doe the business need to sell to break even?
2. Solve the following system of equations using elimination or matrices.
x-1y+z=6
2x+y-3z=-3
x-3y+3z=10