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Varvara68 [4.7K]
3 years ago
14

2x+8y = 6 15x + 20y = 15

Mathematics
1 answer:
Likurg_2 [28]3 years ago
4 0

Answer:

The solution is (0, 3/4)

Step-by-step explanation:

Please copy and share the instructions.  Here they are:  Solve the following system of linear equations.

Both of the equations can be reduced (simplified):

2x+8y = 6            =>  x + 4y = 3

15x + 20y = 15     => 3x + 4y = 3

Let's use the elimination by addition and subtraction method.  Multiply the first equation by -1, obtaining

                                 -x - 4y = -3

Add the second       3x + 4y = 3

equation to the

first.

We get:                       2x = 0.

Thus, x = 0.  Substituting 0 for x in the 1st original equation yields:

2(0) + 8y = 6.  Then y = 6/8, or y = 3/4.

The solution is (0, 3/4).

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4 0
3 years ago
Keelah clothing store buys coats for $50 and then sells them for $80. What is the percent of markup on the price of the coat?
REY [17]

50*x=80 (x=percent in decimal form)

x=1.6 (divide both sides by 50)

Doubke check:

50*1.6=80

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4 0
3 years ago
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Answer:

option c

Step-by-step explanation:

<u>Volume = Length * Width * Height </u>

this is a pretty easy problem cuz all u need to do is find which one of the options has a product of 729.

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8*9*11 = 792. cant be the box cuz 792 does not equal 729

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5 0
3 years ago
A sample of 1000 college students at NC State University were randomly selected for a survey. Among the survey participants, 102
cupoosta [38]

Answer:

The upper endpoint of the 99% confidence interval for population proportion is 0.13.

Step-by-step explanation:

The confidence interval for population proportion is:

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<u>Given:</u>

<em>n</em> = 1000

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*Use the standard normal table for the critical value.

Compute the 99% confidence interval for population proportion as follows:

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Thus, the upper limit of the 99% confidence interval for population proportion is 0.13.

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