SOLUTION: Two buses leave atlanta at the same time traveling in opposite directions. One travels at an average speed of 75 mph and the other at 60mph. In how many hours will they be 405 mile

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons  -> Linear Equations Lesson -> SOLUTION: Two buses leave atlanta at the same time traveling in opposite directions. One travels at an average speed of 75 mph and the other at 60mph. In how many hours will they be 405 mile      Log On


   

Question 658946: Two buses leave atlanta at the same time traveling in opposite directions. One travels at an average speed of 75 mph and the other at 60mph. In how many hours will they be 405 miles apart? Let x= time of travel for the first bus and y= time of travel for the second bus. Then the system that models the problem is {x = y
{75x+60y=405 .. Please help me RIGHT AWAY!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint:
If x = y, then you can replace either x or y with the other variable.

So you can replace x or y (or vice versa)

Let's replace x with y in the second equation

75x+60y=405

75y+60y=405


Now solve for y. Once you have y, you automatically know x (since x = y)