Simplify :
(i) $(5 x - 9 y) - (- 7 x + y)$
(ii) $[7 - 2 x + 5 y - (x - y)] - (5 x + 3 y - 7)$

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Solution

$i) . (5 x - 9 y) - (- 7 x + y)$ $= 5 x - 9 y + 7 x - y$
$= 12 x - 10 y$
$= 2 (6 x - 5 y)$

$i i) . [7 - 2 x + 5 y - (x - y)] - (5 x + 3 y - 7)$ $= 7 - 2 x + 5 y - x + y - 5 x - 3 y + 7$
$= - 8 x + 3 y + 14$

Hence, solved.

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