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Korvikt [17]
3 years ago
15

PLEASE HELP Solve the system by substitution -x-y-z=-8 -4x+4y+5z=7 2x+2z=4

Mathematics
1 answer:
Vlada [557]3 years ago
8 0

Solve the first equation for x.

x + 3y = -7

x = -7 - 3y

Now substitute (-7 - 3y) in for x in the second equation.

2x + 4y = -4

2(-7 - 3y) + 4y  = -4

Solve to find the value of y.

-14 - 6y + 4y = -4

-14 - 2y = -4

-2y = 10

y = -5

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1. Mrs. Nelson wants to buy a wireless speaker for her son. She has narrowed down her choice to two stores:
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a) Mrs. Nelson will pay $45 for the speaker at Kohl's.

b) Mrs. Nelson would pay $43.70 for the speaker at Target.

c) Mrs. Nelson would get the best deal from Target's.

Step-by-step explanation:

Selling price at Kohl = $60.00

Discount coupon = 25%

Purchase price of Target = $38.00

Mark up = 15%

a.) How much would Mrs. Nelson pay for the speaker at Kohl’s?

Discount = 25% of selling price

Discount amount = \frac{25}{100}*60=\frac{1500}{100}

Discount amount = $15

Cost after discount = Selling price - Discount amount

Cost after discount = 60-15 = $45

Mrs. Nelson will pay $45 for the speaker at Kohl's.

b.) How much would Mrs. Nelson pay for this speaker at Target?

Mark up = 15% of purchase price

Mark up amount = \frac{15}{100}*38=\frac{570}{100}

Mark up amount = $5.70

Price after mark up = Purchase price + Mark up amount

Price after mark up = 38.00+5.70 = $43.70

Mrs. Nelson would pay $43.70 for the speaker at Target.

c.) Which store would Mrs. Nelson get the best deal and by how much?

Difference between prices = 45-43.70 = $1.30

Mrs. Nelson will save $15 on Kohl's and she will get the speaker at $43.70 at Target's, therefore, she would save $1.30 more if she buys speaker from Target's.

Mrs. Nelson would get the best deal from Target's.

Keywords: mark up, discount

Learn more about mark up at:

  • brainly.com/question/1849465
  • brainly.com/question/1859525

#LearnwithBrainly

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How can you use geometry figures to solve real world problems
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3 years ago
Suppose a study estimated that 63% of the residents of a community (with an
Anvisha [2.4K]

Answer:

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Step-by-step explanation:

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4 years ago
What is 4/5 written as a percent?<br> A. 0.8%<br> B. 8%<br> C. 80%<br> D. 800%
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Hi,

100/5 = 20
20 x 4 = 80

The answer is 80%

Hope this helps! :)
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3 years ago
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