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3 years ago

9

2. Which variable expression represents the phrase "Twice the sum of a number and seven"

1 answer:

zalisa [80]3 years ago

7 0

Answer:

(n+7)x2

Step-by-step explanation:

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Solve: <br>x + y = 7<br>3x - 2y = 11<br><br>By using Substituting method.

Salsk061 [2.6K]

$\large\underline{\sf{Solution-}}$

$\sf \longmapsto x + y = 7 \: \: - - - (i)$

$\sf \longmapsto 3x - 2y = 11 \: \: - - - (ii)$

<u>By first equation,</u>

$\sf \longmapsto x + y = 7$

$\sf \longmapsto x = 7 - y$

<u>Now, we can find the original value of y.</u>

$\sf \longmapsto 3x - 2y = 11$

$\sf \longmapsto 3(7 - y) - 2y = 11$

$\sf \longmapsto 21 - 3y - 2y = 11$

$\sf \longmapsto 21 - 5y = 11$

$\sf \longmapsto - 5y = 11 - 21$

$\sf \longmapsto - 5y = - 10$

$\sf \longmapsto y = \dfrac{ - 10}{ - 5}$

$\sf \longmapsto y = 2$

<u>Now, we can find the original value of x.</u>

$\sf \longmapsto x + y = 7$

$\sf \longmapsto x + 2 = 7$

$\sf \longmapsto x = 7 - 2$

$\sf \longmapsto x = 5$

Therefore, the values of x and y are 5 and 2 respectively.

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2 years ago

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3m-n=km-8, solve for m

viktelen [127]

Add n on both sides:

3m = km - 8 + n

Subtract km on both sides:

3m - km = n - 8

Factor the Left-Hand Side:

m(3 - k) = n - 8

Divide both sides by (3 - k):

m = (n - 8) / (3 - k)

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−5(x + 4) + 21 ≥ −3 + 4(x − 8)

wariber [46]

Step-by-step explanation:

-5x - 20 +21 > - 3 +4x - 32

-5x +1 > 4x - 35

-5x +4x > - 35 +5

-1x>-30

Divide by - 1

x >30

Am I right??

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Here it is:
y=|x|-0.75

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If BE=2/3BC, what additional

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Answer:

Explanation:

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