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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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What is the opposite of the opposite of the number located at point a?
julsineya [31]

Answer:

A

Step-by-step explanation:

The opposite of point A is 9

Because the opposite of -9 is 9

And the opposite of 9 is -9

3 0
3 years ago
What is 1.83 repeating as a fraction?
maks197457 [2]
The answer to this question would be: 1 5/6

To change a decimal number into fraction, you need to divide the number on the right of decimal point with 1. In this case, the number is 0.83.
This number is hard since .83 doesn't have many factors. To find the answer you can try to multiply the decimal with some number until it close to 1(no decimal left)
0.83* 2= 1.66
0.83* 3= 2.49 ---> close to half, if you find this number, you can try to double it
0.83* 4= 3.32
0.83* 5= 4.15
0.83* 6= 4.98---> close to 1, that means there is high probability that the number can be divided by 6 
0.83 would be 4.98/6, but if we assume that the number is 0.8333...... then 0.83 would be 5/6. So, 1.83 would be 1 5/6
4 0
3 years ago
Read 2 more answers
Write the quadratic equation whose roots are −2 and 6, and whose leading coefficient is 3
MaRussiya [10]

Answer:

3(x + 2)(x - 6) = 0

Step-by-step explanation:

We see that if x + 2 = o then x= -2

and if x - 6 = 0,  x = 6.

4 0
3 years ago
Fill in the blanks<br> 3:4 = 6:_ = 9:_ = _:16 = _:20 = 18:_?????
Virty [35]

3:4 = 6:8 = 9:12 = 12:16 = 15:20 = 18:24

3 0
3 years ago
Find the selling price. Cost to store: $90 Markup: 60%
Arturiano [62]
$135
60% markup means 60 percent of 90 dollars added back into the price 
45 is 60 percent of 90 dollars so you would add that to $90
6 0
3 years ago
Read 2 more answers
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