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3 years ago

How would you solve 3x + y = -14

Mathematics

2 answers:

yanalaym [24]3 years ago

6 0

Answer:

$\frac{ - 23}{5}$

$\frac{ - 1}{5}$

Step-by-step explanation:

3x+y=-14

2x-y=-9

5x=-23

Effectus [21]3 years ago

6 0

Answer:

$x= \frac{-23}{5}, y=\frac{-1}{5}$

Step-by-step explanation:

3x + y = -14

-2x + y = 9

<em>We'll try to find x</em>

<em>(-2x + y = 9) multiplied by -1 => -1(-2x+y=9) =</em> <em>2x-y = -9</em>

3x + y = -14

+2x -y = -9

+__________

3x + 2x +y -y = -14 - 9

5x = -23

<em>x = -23/5</em>

3x + y = -14 =><em>And now we can find y. Just plug in -23/5 for x </em>

$3\frac{-23}{5} + y = -14$

$\frac{-69}{5} + \frac{5y}{5} = \frac{-70}{5}$

$\frac{5y}{5} =\frac{-1}{5}$

5y = -1

<em>y = -1/5</em>

Hope this helps ^-^

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<h3>The probability that it rains at most 2 days</h3>

The given parameters are:

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The probability that it rains at most 2 days is represented as:

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$P(0) = ^7C_0 * (92\%)^0 * (1 - 92\%)^{7 - 0} = 0.00000002097$

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So, we have:

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This is calculated as:

Mean = np

So, we have:

Mean = 7 * 92%

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Mean = 6.44

Hence, the mean is 6.44

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This is calculated as:

σ = √np(1 - p)

So, we have:

σ = √7 * 92%(1 - 92%)

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σ = 0.718

Hence, the standard deviation is 0.718

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We have:

σ = 0.718

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3 years ago

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Step-by-step explanation:

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So, the answer is:

The best fit is <em>A. Linear model</em>

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4 years ago