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4 years ago

3x-y=3 I need to find x and y

Mathematics

2 answers:

zubka84 [21]4 years ago

7 0

Answer:

Step-by-step explanation:

I believe X= 2 and Y=3

Anika [276]4 years ago

5 0

well,

3x-y=3

1.x=0

y=-4

2. x=1

y=0

3. x=2

y=3

4.x=3

y=6

5. x=4

y=9

m. x=n

y=3(x-1)

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How to solve these type of problems?

Juli2301 [7.4K]

You wing that and hope you get it right!

8 0

4 years ago

URGENT: statistics: A researcher wishes to estimate the percentage of adults who support abolishing the penny what size sample s

irina1246 [14]

Using the margin of error for the z-distribution, the sample sizes are given as follows:

a) 822.

b) 1068.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

The margin of error is given by:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which:

$\pi$ is the sample proportion.

z is the critical value.

n is the sample size.

We have a 95% confidence level, hence $\alpha = 0.95$ , z is the value of Z that has a p-value of $\frac{1+0.95}{2} = 0.975$ , so the critical value is z = 1.96.

Item a:

The estimate is of $\pi = 0.26$ , hence we solve for n when M = 0.03.

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.96\sqrt{\frac{0.26(0.74)}{n}}$

$0.03\sqrt{n} = 1.96\sqrt{0.26(0.74)}$

$\sqrt{n} = \frac{1.96\sqrt{0.26(0.74)}}{0.03}$

$(\sqrt{n})^2 = \left(\frac{1.96\sqrt{0.26(0.74)}}{0.03}\right)^2$

n = 821.2

A sample of 822 is needed.

Item b:

No prior estimate, hence $\pi = 0.5$ .

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.96\sqrt{\frac{0.5(0.5)}{n}}$

$0.03\sqrt{n} = 1.96\sqrt{0.5(0.5)}$

$\sqrt{n} = \frac{1.96\sqrt{0.5(0.5)}}{0.03}$

$(\sqrt{n})^2 = \left(\frac{1.96\sqrt{0.5(0.5)}}{0.03}\right)^2$

n = 1067.11

A sample of 1068 is needed.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0

2 years ago

Can you please answer this?

Svet_ta [14]

A) x + 4y = -15
B) -2x -8y = 30
Multiplying A) by 2
A) 2x + 8y = -30
This has NO solution because A) and B) are actually the same equation.
Equation B = Equation A times minus 2.

6 0

3 years ago

How would I rewrite this?

Anvisha [2.4K]

Answer:

-The answer is $y^2$ .