Express the following statement as an algebraic expression:
"9y decreased by 5x gives 7z"

5x - 9y = 7z

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9y - 5x = 7z

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9y +5x = 7z

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5x -7z = 9y

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Solution

The correct option is B 9y - 5x = 7z
To simplify the formation of an algebraic expression, let us put numerals to this statement in place of variables:
Suppose the statement was 10 decreased by 3 is equal to 7.
We would be able to write 10 - 3 = 7 easily.
Now replace 10 by 9y, 3 by 5x and 7 by 7z:
The correct option is : 9y - 5x = 7z

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