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4 years ago

8y=28-4x 6x+8y=6 find the solution to the system of equations

Mathematics

1 answer:

sesenic [268]4 years ago

8 0

first equation equivalent to

4x+8y=28

substract with second equation

-2x=22

divide with -2

x=-11

substitute to first equation

8y=28-4(-11)

8y=72

divide with 8

y=9

so the solution is (-11,9)

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deff fn [24]

So first you would have to add $25+$13.50=38.5 then subtract 38.5-2.68=35.82

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3 years ago

If 3x-5=6x-2 is -1. Then how do I do a check step? :(

8090 [49]

Answer:

ok,just substitute the x for -1

3x-5=6x-2

3(-1)-5=6(-1)-2

-3-5 = -6-2

-8 = -8

TRUE

So,the solution is correct.-1 is the correct solution

I hope this help,Please give me the brainliest

Step-by-step explanation:

6 0

3 years ago

Help please its percents ! I need

harina [27]

X % = x/100 as a fraction
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4 0

3 years ago

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The standard IQ test is designed so that the mean is 100100 and the standard deviation is 1515 for the population of all adults.

Natalija [7]

Answer:

The sample size should be approximately 151.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 100

Population standard deviation, σ = 15

We have to evaluate the sample size, n.

Alpha, α = 0.10

Confidence interval:

$\mu \pm z_{critical}\frac{\sigma}{\sqrt{n}}$

Putting the values, we get,

$z_{critical}\text{ at}~\alpha_{0.10} = \pm 1.64$

$100 \pm 1.64(\frac{15}{\sqrt{n}} ) = (98,102)$

$100 \pm 1.64(\displaystyle\frac{15}{\sqrt{n}} ) = (98,102)\\\\1.64(\frac{15}{\sqrt{n}} ) = 2\\\\n = 151.29 \approx 151$

Thus, the sample size should be approximately 151.

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3 years ago

A=12 B=5 C=2. who ever can answer this question will get the brainest

Furkat [3]

72
---- -- 2 = 36 - 2 = 34
2

4 0

4 years ago

Read 2 more answers