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JulsSmile [24]
2 years ago
7

if you were to solve the following system by substitution, what would be the best variable to solve for and from what equation?

2x+8y=12 3x-8y=11
Mathematics
1 answer:
Romashka-Z-Leto [24]2 years ago
6 0

Answer:

see below

Step-by-step explanation:

2x+8y=12 3x-8y=11

If we have to solve by substitution, Take the first equation and divide by 2

2x/2 + 8y/2 =12/2

x+4y = 6

Then subtract 4y from each side

x = 6 -4y

Then substitute this into the second equation

This is best solved by elimination

2x+8y=12

3x-8y=11

----------------

5x = 36

x = 36/5

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Answer:

z=\frac{10.6-12}{\frac{4.1}{\sqrt{45}}}=-2.29  

Step-by-step explanation:

information given

\bar X=10.6 represent the sample mean  

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We want to test if the true mean is less than 12, the system of hypothesis would be:  

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Replacing the info given we got:

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z=\frac{10.6-12}{\frac{4.1}{\sqrt{45}}}=-2.29  

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