Before leaving for a road trip to Mount Rushmore, Myra's dad stops to get gas for his van. The total cost of the gas increases as Myra's dad fills the van. This situation can be modeled as a linear relationship. 2 4 6 8 10 12 14 16 18 20 $10 $20 $30 $40 $50 $60 $70 $80 $90 $100 x y Gallons of gas Total cost What does the slope of the line tell you about the situation?