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3 years ago

6. Solve the following system of equations

Mathematics

2 answers:

Setler79 [48]3 years ago

3 0

The answer is A. you basically just plug the numbers in and see which one is correct.

JulijaS [17]3 years ago

3 0

Answer:

A, x=-1, y=4

Step-by-step explanation:

First off you have to get rid of the y, so you have to multiply the the whole first equation by 5, and the whole second equation by 3, and then you can add your ys together and get 0 and you want to add both of the equations together. it will leave you with 34x=-34 so x=-1. take the first equation and plug in the answer you got, so it should be -5+3y=7, add 5 to both sides and then you will get 3y=12 divide that by 3 and you have y=4. So the answer is x=-1, y=4

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Mixed number equals 16/10

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Answer:

1.6

Step-by-step explanation:

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3 years ago

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Angelina_Jolie [31]

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3 years ago

(Set up and solve the system, then answer the associated question)

Dimas [21]

9514 1404 393

Answer:

red division: 6 teams
blue division: 5 teams

Step-by-step explanation:

We can let r and b represent the numbers of teams in the red and blue divisions, respectively. The total number of goals scored in each division will be the average for that division times the number of teams in that division.

r - b = 1 . . . . . . there is 1 more red team than blue

4.5r +4.2b = 48 . . . . . . total goals scored per week

Solving by substitution, we have ...

r = b +1

4.5(b +1) +4.2b = 48 . . . . substitute for r

8.7b +4.5 = 48 . . . . . . . . simplify

8.7b = 43.5 . . . . . . . . . . subtract 4.5

b = 43.5/8.7 = 5 . . . . . divide by 8.7

r = b +1 = 6 . . . . . . . . . find r

There are 6 red teams and 5 blue teams.

_____

<em>Additional comment</em>

The basic idea is that you make an equation for each relation given in the problem statement. For a problem like this, you do need to have an understanding of how the average number of goals would be calculated and how that relates to the total goals.

8 0

2 years ago

Sales Gi sells televisions. He earns a fixed amount for each television and an additional $15 if the buyer gets an extended warr

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Answer:

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Step-by-step explanation:

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Then subtract 960-180= 780

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2 years ago

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gogolik [260]

Answer:

Step-by-step explanation:

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2 years ago