You now have a lot of experience working with equations that compare two quantities. For example, while working on the Big Race, you found relationships of the form y = mx + by=mx+b, which compared x (time in seconds) with y (distance in meters). If a participant's race can be modeled with the equation y= 3x+4y=3x+4: a. How much of a head start did the participant get? How can you tell from the equation? b. What was participant's rate of speed? That is, how fast did they go? Justify your answer.