When Sara adds $5 x y$ and $- 7 x y,$ she's going to get.

2 x y

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- 2 x y

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12 x y

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- 12 x y

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Solution

The correct option is B $- 2 x y$
Given:

Sara adds $5 x y$ and $- 7 x y$

$= 5 x y + (- 7 x y)$

$= 5 x y - 7 x y$

[Combining like terms]

$= - 2 x y$

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When $7 x y + 5 y z - 3 z x$ , $4 y z + 9 z x - 4 y$ and $- 3 x z + 5 x - 2 x y$ are added, we get $5 x y + 9 y z + 3 z x + 5 x - 4 y$ .

2 x + 9 z - 2 x y

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6 x - 12 y + 3 z

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