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Studentka2010 [4]
3 years ago
10

Need help with 9 please

Mathematics
1 answer:
Debora [2.8K]3 years ago
6 0

Answer:

x = 5

y = 1

Step-by-step explanation:

So move 2y from the second equation to the other side of the equals sign

2x +3y = 13

x = 3 + 2y

From here substitute X into the first equation

2(3 + 2y) + 3y = 13

Distribute

6 + 4y +3y = 13

Combine like terms and solve for y

7y = 7

y = 1

insert result into the original equation.

x-2(1) = 3

x - 2 = 3

x = 5

insert into other equation to check work

2(5) + 3(1) = 13

10 + 3 = 13 correct

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Hello!

To test whether the typing speed differs when using word processor A or B a random sample of 25 typists was taken, they first used the word processor A and their times were recorded. Then they used the word processor B and their times were recorded. With the information obtained the variable difference Xd: Xa -Xb was determined. (This is a paired sample case)

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<em>Remember, to decide a hypothesis test using a confidence interval, the following conditions should be met:</em>

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If these conditions are met, you can decide using the confidence interval using the decision rule:

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