In a Washington town, the charge for commercial waste collection is $694.55 for 5 tons and $1098.32 for 8 tons of waste. 

(a) Find a linear formula for the cost, C, of waste collection as a function of the weight, ω, in tons. 

(b) What is the slope of the line found in part (a)? Give units and interpret your answer in terms of the cost of waste collection. 

(c) What is the vertical intercept of the line found in part (a)? Give units and interpret your answer in terms of the cost of waste collection.