Question 148949
x=time from Alburquerque to Roswell (in hrs)
y=time from Roswell to Carlsbad (in hrs)
coefficient=mph


75x+70y=220----------------because hr times mph gives you total miles
x+y=3----------------------total time is 3 hrs


Solve for y in the second equation
y=3-x


Plug that into the first equation
75x+70(3-x)=220


Distribute
75x+210-70x=220


Combine like terms
5x+210=220


Subtract 210
5x=10
x=2


x=time from Alburquerque to Roswell (in hrs)


time from Alburquerque to Roswell=2 hrs.