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romanna [79]
3 years ago
13

Use the elimination method to solve the system of equations. Choose the

Mathematics
2 answers:
MatroZZZ [7]3 years ago
6 0

Answer:

C

Step-by-step explanation:

7x + 3y = 30 (equation 1)

-2x + 3y = 3 (equation 2)

9x = 27 (subtract the two equations to eliminate y)

x = 3 (divide by 9)

7 * 3 + 3y = 30 (Substitute x = 3 into equation 1, it doesn't matter which equation you substitute into)

21 + 3y = 30 (7 * 3 = 21)

3y = 9 (Subtract 21)

y = 3 (divide by 3)

Answer is (3, 3)

Nikitich [7]3 years ago
3 0

Answer:

(3,3)

Step-by-step explanation:

7x + 3y = 30

-2x + 3y= 3

Multiply the second equation by -1 and add together to eliminate y

7x + 3y = 30

2x - 3y= -3

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

9x + 0y = 27

Divide by 9

9x/9 = 27/9

x = 3

Now find y

-2x+3y = 3

-2(3) +3y =3

-6 +3y = 3

Add 6 to each side

3y = 3+6

3y=9

Divide by 3

y = 3

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Which of the following numbers is proportional to 84/108?
lara [203]

Proportional numbers are numbers with the same equivalent ratio

98/126 is proportional to 84/108

The number is given as:

Number = \frac{84}{108}

Reduce fraction to the lowest term

Number = \frac{7}{9}

Reduce 86/110 to the lowest term

Number = \frac{86}{110}

Divide by 2/2

Number = \frac{43}{55}

43/55 is not equivalent to 7/9

Reduce 98/126 to the lowest term

Number = \frac{98}{126}

Divide by 14/14

Number = \frac{7}{9}

7/9 is equivalent to 7/9.

Hence, 98/126 is proportional to 84/108

Read more about proportional numbers at:

brainly.com/question/1781657

8 0
2 years ago
Students are making ornaments and each takes 1 2 of a piece of Bristol board. They go to the cupboard and find 1 1 2 pieces of B
s2008m [1.1K]

Answer: 3

Step-by-step explanation:

Feom the question, we are informed that students are making ornaments and each takes 1/2 of a piece of Bristol board and that they go to the cupboard and find 1 1/2 pieces of Bristol board.

The number of ornaments that they can make will be calculated by dividing 1 1/2 by 1/2. This will be:

= 1 1/2 ÷ 1/2

= 3/2 ÷ 1/2

= 3/2 × 2/1

= 3

They can make 3 ornaments

8 0
3 years ago
the thickness of a surfboard relates to the weight of the surfer. A surfboard is 21 3/16 inches wide and 2 3/8 inches thick. Wri
Mrac [35]
21 3/16=21.1875
2 3/8=2.375
7 0
3 years ago
Show your work please.
Kruka [31]

Answer:

Tauren has 78 keychains

James has 34 keychains

Marcus has 68 keychains

Yahya has 74 keychains

Step-by-step explanation:

I got this answer by doing this:

If Tauren has 78 keychains then its gonna be left like that.

If everybody else has an average of 68 keychains then divide 68 by 2 to get half of what marcus has which equals 34.

Then add the amount of James and marcus keychains which is 68 plus 34 which equals 102, the subtract the 28 because it says Yayha has 28 fewer keychains and that equals 74.

3 0
3 years ago
Obtain the general solution:<br><br> (x-y)(4x+y)dx + x(5x-y)dy = 0
storchak [24]

Answer:

y=2x

y=-x

d=0

Step-by-step explanation:

sorry iam not sure i just tray to help

7 0
2 years ago
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