1a) A house contractor needs to repair the roof on a
home. She wants to hire the company that will give her
the lowest price. The two options are shown below:
- Everyday Roofing: charges $80 plus $2 per shingle
- Quality Concrete: charges $60 plus $3 per shingle
We can represent the cost of repairing the roof using
these two companies with two equations:
- Everyday Roofing: y = 2x + 80
- Quality Concrete: y = 3x + 60
In these two equations, what does the "X" represent?