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3 years ago

ANSWER ASAP I WILL MAKE BRAINLYIST

Mathematics

2 answers:

aniked [119]3 years ago

8 0

X+2y=4

+-x-4y=-14

——————

-2y=-10, y=5, x=4-10=-6

ratelena [41]3 years ago

8 0

Answer:

x = -6

y = 5

Step-by-step explanation:

Add the equations

1x + 2y = 4

-1x - 4y = -14

————————

-2y = -10

Divide both sides by -2

y = 5

Substitute for y = 5 into either equation

using 1x + 2y = 4

1x + 2(5) = 4

1x + 10 = 4

Subtract 10 from both sides

1x = -6

x = -6

Solution

x = -6

y = 5

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Step-by-step explanation:

Assuming the following dataset:

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Part a

And we want a linear model on this way y=mx+b, where m represent the slope and b the intercept. In order to find the slope we have this formula:

$m=\frac{S_{xy}}{S_{xx}}$

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Part b

For this case we need to calculate the correlation coefficient given by:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

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