A broken furnace will cost $300 to repair. A new, more efficient furnace will cost $2,700. The present furnace averages about $700 per year for energy cost and the new furnace would average about $400 per year. The total cost, c, of either repairing the broken furnace or buying a replacement plus energy cost over n years can
be represented by an equation. Write and graph a system to find how many years it would take for the
total cost of repair to equal the total cost of replacement.

QUESTION: it would take ___?___ years for the total cost to repair to equal the total costs of replacement.