Ineed this question is worth 15 points.

answer:

c

step-by-step explanation:

3.5 miles is a given starting point, since that is the distance he has traveled so far. you cannot travel a negative distance, unless you were traveling from your office back to home. 100 miles every two hours = 50 miles every hour.

y (distance traveled) = 3.5 (miles already traveled) + 50x (50 miles traveled per hour from the 3.5 miles starting point)

y = 3.5 + 50x is your answer.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.