Question 8: I Can Write the y=mx Form Equation of the Line.
 A train traveled 120 miles in 3 hours. The train traveled at a constant speed. If the
 train continues to travel at this rate, which equation can be used to determine y,
 the total number of miles the train will travel, in x hours?
 A. y = 40x + 20
 B. y = 40x
 C. 40y = x
 D. 40 + y = x