Set up a system of linear equations in two variables that models the problem. Then solve the system of linear equations. A person plans to build a cabin at the lake and wants to get bids from two contractors to determine its cost. The first contractor gives a quote of $ 20,000 plus $ 100 per square foot for the cabin. The second contractor gives a quote of $ 60,000 plus $ 60 per square foot. For how many square feet will the two contractors charge the same amount? What is that cost