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)![]() ![]() 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 = \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( " |