An eastbound car is going 5 miles per hour faster than a westbound car. The cars are 225 miles apart 5 hours after passing each other on a highway. What is the speed, in
miles per hour, of the eastbound car?

Part 1) The system has no solution

Par 2) The system has one solution

Step-by-step explanation:

Part 1) we have

----> equation A

----> equation B

Remember that

If two lines are parallel then their slopes are equal

In this problem line A and line B have the same slope and different y-intercept

so

The lines don't intersect (the solution is the intersection point both lines)

therefore

The system has no solution

see the attached figure N 1 to better understand the problem

Part 2) we have

-----> equation A

-----> equation B

Remember that

If two lines have different slope then the lines have one intersection point

In this problem line A and line B have different slopes

therefore

The system has one solution (the solution is the intersection point both lines)

see the attached figure N 2 to better understand the problem