SOLUTION: 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

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: 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       Log On


   

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.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28z%5B1%5D%2Bz%5B2%5D%29%2F2=2x%2By
z%5B1%5D%2Bz%5B2%5D=4x%2B2y
.
.
.
z%5B3%5D=5x%2B4y
So then,
%28z%5B1%5D%2Bz%5B2%5D%2Bz%5B3%5D%29%2F3=%284x%2B2y%2B5x%2B4y%29%2F3
%28z%5B1%5D%2Bz%5B2%5D%2Bz%5B3%5D%29%2F3=%289x%2B6y%29%2F3
%28z%5B1%5D%2Bz%5B2%5D%2Bz%5B3%5D%29%2F3=3x%2B2y