Anyone can do.. For me
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P=x+2y,Q=x-2y
-->2P=2x+4y
2P+Q=2x+4y+x -2y=3x+2y
2Q=2x-4y
--->P-2Q=x+2y-2x+4y=6y-x
(2P+Q)-(P-2Q)=3x+2y-6y+x=4x-4y
-->2P=2x+4y
2P+Q=2x+4y+x -2y=3x+2y
2Q=2x-4y
--->P-2Q=x+2y-2x+4y=6y-x
(2P+Q)-(P-2Q)=3x+2y-6y+x=4x-4y
vickysangma90:
but the ans is 4(x-y)
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