The sum of 3x - 9y - 7z and 6x - 2y is nbsp-6x - 11y - 7z9x - 9y - 7z6x - 9y9x - 11y - 7z

The correct option is D 9x + 11y + 7z nbsp;The sum of nbsp; 3x + 9y + 7z and 6x + 2y is (3x + 9y + 7z) + nbsp;(6x + 2y). Simplifying and rearranging the l ...

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Standard VII

Mathematics

The sum of 3x...

Question

The sum of $3 x + 9 y + 7 z$ and $6 x + 2 y$ is .

6 x + 11 y + 7 z

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9 x + 9 y + 7 z

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6 x + 9 y

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9 x + 11 y + 7 z

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Solution

The correct option is D $9 x + 11 y + 7 z$
The sum of $3 x + 9 y + 7 z$ and $6 x + 2 y$ is
$(3 x + 9 y + 7 z) + (6 x + 2 y) .$
Simplifying and rearranging the like terms,we get
$(3 x + 6 x) + (9 y + 2 y) + 7 z = 9 x + 11 y + 7 z .$
So, the sum of $3 x + 9 y + 7 z$ and $6 x + 2 y$ is $9 x + 11 y + 7 z .$

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Similar questions

Q. (iii) 9x + 11y = 78; 11x + 9y = 82

Q. Show that each of the following systems of linear equations is consistent and also find their solutions:
(i) 6x + 4y = 2
9x + 6y = 3

(ii) 2x + 3y = 5
6x + 9y = 15

(iii) 5x + 3y + 7z = 4
3x + 26y + 2z = 9
7x + 2y + 10z = 5

(iv) x − y + z = 3
2x + y − z = 2
−x −2y + 2z = 1

(v) x + y + z = 6
x + 2y + 3z = 14
x + 4y + 7z = 30

(vi) 2x + 2y − 2z = 1
4x + 4y − z = 2
6x + 6y + 2z = 3

Q. Solve:

6 x + 3 y = 7 x y and 3 x + 9 y = 11 x y

3 x + 9 y = 11 x y, 6 x + 3 y = 7 x y (x \neq 0, y \neq 0) .

Q. The sum of

3 x + 9 y + 7 z

and

6 x + 2 y

is .

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Standard VII Mathematics

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The sum of 3x+9y+7z and 6x+2y is .

The correct option is D 9x+11y+7z The sum of 3x+9y+7z and 6x+2y is (3x+9y+7z)+(6x+2y). Simplifying and rearranging the like terms,we get (3x+6x)+(9y+2y)+7z=9x+11y+7z. So, the sum of 3x+9y+7z and 6x+2y is 9x+11y+7z.

The sum of $3 x + 9 y + 7 z$ and $6 x + 2 y$ is .