The repair bill, y, of a car is proportional to x, the number of labor hours. The constant of proportionality is 42.50. Which will check that y is proportional to x?
Graph y=42.50 x and check that the graph is a straight line that goes through (0,0)
Graph x=42.50 y and check that the graph is a straight line that goes through (0, 0)
Graph y=42.50 x and check that the graph is a straight line that goes through (1, 0)
Graph y= 42.50 x and check that the graph is a straight line that goes through (1, 40)