Sorry for so much trouble but what is the second step for 4x-9=15

What is the slope of the equation y =

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?