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3 years ago

use the elimination method to slove the system of equations.choose the correct ordered pair.6x+2y=8 12x+y=22

Mathematics

2 answers:

snow_tiger [21]3 years ago

8 0

Answer:

( 2, -2 )

Step-by-step explanation:

6x + 2y = 8 divide everything by -2

-3x - y = -4

12x + y = 22 Add the two equations together

9x + 0 = 18 divide by 9

x = 2

plug the x value into either equation to find y

12(2) + y = 22

24 + y = 22

y = -2

verify your result with the other equation

6(2) + 2(-2) = 8

12 - 4 = 8

8 = 8 verified.

Gelneren [198K]3 years ago

4 0

Answer: use photo. math

Step-by-step explanation:

boom

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Factor out like terms
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dsp73

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makvit [3.9K]

Answer:

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Step-by-step explanation:

AC = AB + BC = 2AB

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3 years ago

The mean amount purchased by a typical customer at Churchill’s Grocery Store is $23.50, with a standard deviation of $5.00. Assu

m_a_m_a [10]

Answer: 0.0170

Step-by-step explanation:

Given : The mean amount purchased by a typical customer at Churchill’s Grocery Store is $23.50, with a standard deviation of $5.00.

i.e. $\mu=23.50$

$\sigma=5$

We assume the distribution of amounts purchased follows the normal distribution.

Sample size : n=50

Let $\overline{x}$ be the sample mean.

Formula : $z=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

Then, the probability that the sample mean is at least $25.00 will be :-

$P(\overline{x}\geq\25.00)=P(\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}\geq\dfrac{25-23.50}{\dfrac{5}{\sqrt{50}}})\\\\=P(z\geq2.12)\\\\=1-P(z$

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alukav5142 [94]

Answer:

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Step-by-step explanation:

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