document.write( "Question 945473: The average of two values is 2x+y. If a third value of 5x+4y is included, find the average of all three of the values. Express your answer as a simplified polynomial expression in terms of x and y. Thanks for your help. \n" ); document.write( "
Algebra.Com's Answer #576650 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
\"%28z%5B1%5D%2Bz%5B2%5D%29%2F2=2x%2By\"
\n" ); document.write( "\"z%5B1%5D%2Bz%5B2%5D=4x%2B2y\"
\n" ); document.write( ".
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\n" ); document.write( "\"z%5B3%5D=5x%2B4y\"
\n" ); document.write( "So then,
\n" ); document.write( "\"%28z%5B1%5D%2Bz%5B2%5D%2Bz%5B3%5D%29%2F3=%284x%2B2y%2B5x%2B4y%29%2F3\"
\n" ); document.write( "\"%28z%5B1%5D%2Bz%5B2%5D%2Bz%5B3%5D%29%2F3=%289x%2B6y%29%2F3\"
\n" ); document.write( "\"%28z%5B1%5D%2Bz%5B2%5D%2Bz%5B3%5D%29%2F3=3x%2B2y\"
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