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Alina [70]
3 years ago
14

only number 4, and please include the working. also do it with the substitution method not elimination or any other.​

Mathematics
1 answer:
sergiy2304 [10]3 years ago
6 0

Answer:

x = -2 and y = 1

Step-by-step explanation:

→ Rearrange x - y = -3 to make y the subject

-y = - x - 3 so y = x + 3

→ Substitute into 2x + y = -3

2x + x + 3 = -3

→ Simplify

3x + 3 = -3

→ Minus 3 from both sides

3x = -6

→ Divide both sides by 3

x = -2

→ Substitute x value into first equation

-4 + y = -3

→ Add -4 to both sides

y = 1

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3 years ago
An article describes the chemical compositions of certain minerals in the early Archaean mantle. For a certain type of olivine a
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Answer:

The mean is 40.35 and the standard deviation is 0.13.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a certain type of olivine assembly, the silicon dioxide (SiO2) content (in weight percent) in a randomly chosen rock has mean 40.35 and standard deviation 0.4.

Sample of 10:

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5 0
3 years ago
One of the factors of x³ - 27 is x - 3. What is the other factor?
Oksi-84 [34.3K]

Answer:

We know that, a³ - b³ = (a - b)(a² + ab + b²)

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What is the slope of the line that passes through the points (-1, 2) and (-4, 3)?
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3 years ago
Hello its my birthday :D I think A is correct ?? but if its not correct can someone please help
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4 0
3 years ago
Read 2 more answers
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