The equation y = 35.25x + 40 gives the labor cost y of repairing a car if it takes x hours to repair the car. Which statement is true?

For every hour of labor, the cost decreases by $40.

For every hour of labor, the cost decreases by $35.25.

For every hour of labor, the cost increases by $40.

For every hour of labor, the cost increases by $35.25.