document.write( "Question 1109381: y varies directly with x, and y = 60 when x = 20. What is y when x = 16? \n" ); document.write( "
Algebra.Com's Answer #724373 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! Same problem, different numbers. \n" ); document.write( "-------------------------------------------------------------- \n" ); document.write( "y is directly proportional to x, and y = 20 when x = 6. What is y when x = 14? \n" ); document.write( " ---------- \n" ); document.write( " y = k*x \n" ); document.write( " 20 = k*6 \n" ); document.write( " k = 10/3 \n" ); document.write( " ================== \n" ); document.write( " What is y when x = 14? \n" ); document.write( " y = 14*10/3 = 140/3 \n" ); document.write( " -------------------- \n" ); document.write( " You don't have to solve for k: \n" ); document.write( " 20/6 = y/14 \n" ); document.write( " Cross multiply \n" ); document.write( " 6y = 280 \n" ); document.write( " y = 140/3 \n" ); document.write( " |