Question 81 (ii)

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$9 a x + 3 b y - c z, - 5 b y + a x + 3 c z$

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Solution

We have,
$(9 a x + 3 b y - c z) + (- 5 b y + a x + 3 c z)$
$= 9 a x + 3 b y - c z - 5 b y + a x + 3 c z$
$= (9 a x + a x) + (3 b y - 5 b y) + (- c z + 3 c z)$ [grouping like terms]

$= 10 a x - 2 b y + 2 c z$

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Question 81 (ii)

Add :

$9 a x + 3 b y - c z, - 5 b y + a x + 3 c z$

6 a x - 2 b y + 3 c z, 6 b y - 11 a x - c z

10 c z - 2 a x - 3 b y

x, y, z, u

x = b y + c z + d u, y = c z + d u + a x, z = d u + a x + b y, u = a x + b y + c z

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