Barbara, Mark and Carlos are participating in a race. Barbara thought she could win with a 3 meter head start even though she only pedaled 3 meters every 2 seconds. Mark began at the starting line and finished the 20 meter race in 5 seconds. Meanwhile, Carlos rode his tricycle so that his distance (y) from the starting line in meters could be represented by the equation y = 5/2x+1. where x represents time in
seconds.

What is the dependent variable? What is the independent variable?

Pls help!