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kaheart [24]
2 years ago
8

Y-4=3(x+2) in slope intercept form step by step

Mathematics
2 answers:
PtichkaEL [24]2 years ago
7 0

Answer: y = 3x + 10

Step-by-step explanation:

y - 4 = 3(x + 2)

=> y -4 = 3x + 6

=> y = 3x + 10

lbvjy [14]2 years ago
4 0
Have a great day :6))

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Answer:

r=\frac{9(5316)-(70)(740)}{\sqrt{[9(704) -(70)^2][9(62078) -(740)^2]}}=-0.9908  

Step-by-step explanation:

Previous concepts

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

Solution to the problem

In order to calculate the correlation coefficient we can begin doing the following table:

n      x     y      xy        x*x       y*y

1      2    100   200      4        10000

2     5    88     440     25      7744

3     8    82     656     64       6724

4     6    84     504     36      7056

5     11    73     803     121      5329

6     4     94     376     16       8836

7     17    57     969     289    3249

8     10   78      780     100     6084

9     7     84     588      49      7056

And in order to calculate the correlation coefficient we can use this formula:

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

For our case we have this:

n=9 \sum x = 70, \sum y = 740, \sum xy = 5316, \sum x^2 =704, \sum y^2 =62078  

r=\frac{9(5316)-(70)(740)}{\sqrt{[9(704) -(70)^2][9(62078) -(740)^2]}}=-0.9908  

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