All categories

2 years ago

I really need help please

Mathematics

1 answer:

Leno4ka [110]2 years ago

3 0

Answer: one solution at ( -1, 2 )

Step-by-step explanation:

-x + 2y =5

x + y = 1

You cross out the x’s then add 2y + y which will give you 3y. Add the 5 and 1 and you’ll get 6.

3y = 6

Divide 3 to both sides

y = 2

To get x you’ll use the first equation.

-x + 2y = 5

Replace the y with 2

-x + 2(2) = 5

-x + 4 = 5

Move the 4 to the other side, but you’ll need to flip it to negative. So 5 - 4.

-x = 1

Divide both sides by -1

x = -1

You might be interested in

15 more than the absolute value of a number. Someone help please

Scrat [10]

The Expression:

|n| + 15

3 0

2 years ago

What type of polynomial is: 3x^4 - 2x^3 - 2

butalik [34]

This polynomial has only 3 terms, so it is a trinomial. <em>Hope it helps!</em>

3 0

1 year ago

PLEASE HELP - If the sum of the measures of the interior angles of a polygon is twice the sum of its exterior angles, how many s

Tomtit [17]

6 sides so a hexagon

7 0

3 years ago

The proportion of left handed people in the population is about 0.10. Suppose a random sample of 300 people is observed. (a) Wha

pantera1 [17]

Answer: $(\hat{p})\sim N(0.10,\ 0.017)$

Step-by-step explanation:

Sampling distribution of the sample proportion $(\hat{p})$ :

$(\hat{p})\sim N(p,\ \sqrt{\dfrac{p(1-p)}{n}})$

The sampling distribution of the sample proportion $(\hat{p})$ has mean = $\mu_{\hat{p}}=p$ and standard deviation = $\sigma_{\hat{p}}=\sqrt{\dfrac{p(1-p)}{n}}$ .

Given : The proportion of left handed people in the population is about 0.10.

i.e. p=0.10

sample size : n= 300

Then , the sampling distribution of the sample proportion $(\hat{p})$ will be :-

$(\hat{p})\sim N(0.10,\ \sqrt{\dfrac{0.10(1-0.10)}{300}})$

$(\hat{p})\sim N(0.10,\ \sqrt{0.0003})$

$(\hat{p})\sim N(0.10,\ 0.017)$ (approx)

Hence, the sampling distribution of the sample proportion $(\hat{p})$ is $(\hat{p})\sim N(0.10,\ 0.017)$

8 0

3 years ago

A school bake sale eared over $25 from selling cookies, $3 each how many cookies did they sell

MAXImum [283]

For $25 exactly is 8.3 cookies (recurring 3) but that is highly unrealistic, so over 25 dollars is 9 cookies (for 27 dollars) at the very least.

7 0

3 years ago

I really need help please ​

I really need help please