Mr. Williams this $40 a month for 7 gallons of water Mr. Williams pays $40 a month for city water, no matter how many gallons or water he uses in a given month. Let x represent the number of gallons of water used per month. Let y represent the monthly cost of the city water in dollars. What is the equation of the line that represents this information? What is the slope of the line? used in the number of gallons of water used per month
