Question

solve ques 6


back answer on my book is -x+y+2z ​

Answer 1

Step-by-step explanation:

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Answer 2

SOLUTION :

$sum \: of \: 9x - 7y + 8z \: and - 8x + 9y \\ - 7z = x + 2y + z \\ \\ subtracting \: 2x + y - z \: from \\ \: x + 2y + z \\ \\ = > x + 2y + z \\ \\ \: \: \: \: \: \: \: 2x + y - z \\ ( - ) \: \: \: \: ( - ) \: \: \: ( + )\\ - - - - - - - - \\ \\ = - x + y + 2z \\ \\ - - - - - - - - -$

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