document.write( "Question 314018: ) Two cars leave an intersection. One car travels north; the other east. When the car traveling north had gone 9 miles, the distance between the cars was 3 miles more than the distance traveled by the car heading east. How far had the eastbound car traveled? \n" ); document.write( "
Algebra.Com's Answer #224566 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Two cars leave an intersection. One car travels north; the other east.
\n" ); document.write( " When the car traveling north had gone 9 miles, the distance between the cars was
\n" ); document.write( " 3 miles more than the distance traveled by the car heading east.
\n" ); document.write( " How far had the eastbound car traveled?
\n" ); document.write( ":
\n" ); document.write( "Let x = distance traveled by the eastbound car
\n" ); document.write( "then
\n" ); document.write( "(x+3) = distance between the cars when the northbound car had traveled 9 mi
\n" ); document.write( ":
\n" ); document.write( "A pythag problem a^2 + b^2 = c^2
\n" ); document.write( "where
\n" ); document.write( "a = x
\n" ); document.write( "b = 9
\n" ); document.write( "c = (x+3)
\n" ); document.write( ":
\n" ); document.write( "x^2 + 9^2 = (x+3)^2
\n" ); document.write( "x^2 + 81 = x^2 + 6x + 9
\n" ); document.write( "Combine on the left
\n" ); document.write( "x^2 - x^2 - 6x + 81 - 9 = 0
\n" ); document.write( "-6x + 72 = 0
\n" ); document.write( "-6x = -72
\n" ); document.write( "x = \"%28-72%29%2F%28-6%29\"
\n" ); document.write( "x = +12 mi traveled by the eastbound car
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check:
\n" ); document.write( "12^2 + 9^2 = 15^2
\n" ); document.write( "
\n" );