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3 years ago

URGENT 15 POINTS!!!!What is the solution of the system?

2 answers:

8 0

The elimination method is a sufficient way to solve problems.

2x+y= 20
6x-5y=12

Add 5y to the one equation.

2x+6y= 20
6x= 12

Subtract 2x from both sides.

6y= 20
4x= 12

Divide 6 by 20.
y= 3.3

Divide 4 by 12.
x= 3

I hope this helped you!

Brainliest answer is appreciated!

Mila [183]3 years ago

8 0

I don't know if this helps but...
(2x4)+6=10
(6x12) - (5x12) = 12

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5 (2x – 1) –7 = 2 (x – 3)

Sladkaya [172]

Answer:

x−3=x−3

Step-by-step explanation:

Evaluate (2x−1)−7, then set it equal to 2.

Subtract 7 from −1 = 2x−8

Solve 2x−8=2.

Move all terms not containing x to the right side of the equation.

Add 8 to both sides of the equation=2x=2+8

Add 2 and 8=2x=10

Divide each term by 2 and simplify.

Divide each term in 2x=10 by 2=2x/2=10/2

Cancel the common factor of 2

Cancel the common factor=10/2

Divide x by 1=x=10/2

Divide 10 by 2=x=5

Remove parentheses=x−3

List all of the solutions.

(2x−1)−7=2=x=5

x−3=x−3

7 0

3 years ago

The revenue equation (in hundreds of millions of dollars) for barley production in a certain country is approximated by R(x) = 0

STatiana [176]

Answer:

The marginal-revenue equation is $R'(x)=0.1226x+1.1584$ .

The marginal revenue for the production of 200,000,000 bushels is $R'(x)=1.4036$ .

The marginal revenue for the production of 650,000,000 bushels is $R'(x)=9.1274$ .

Step-by-step explanation:

The derivative $R'(x)$ of the revenue function is called the marginal revenue function and is the rate of change of revenue with respect to the number of units sold.

We know the revenue function, $R(x) = 0.0613x^{2} +1.1584x+2.4813$ . Therefore, the marginal revenue function is

$R'(x)=\frac{d}{dx}R(x) = \frac{d}{dx}(0.0613x^{2} +1.1584x+2.4813)\\\\=\frac{d}{dx}\left(0.0613x^2\right)+\frac{d}{dx}\left(1.1584x\right)+\frac{d}{dx}\left(2.4813\right)\\\\R'(x)=0.1226x+1.1584$

To find the marginal revenue for the production of:

200,000,000 bushels we use x = 2, since x is in units of hundreds of million of dollars.

$R'(x)=0.1226\cdot \:2+1.1584\\\\R'(x)=0.2452+1.1584\\\\R'(x)=1.4036$

650,000,000 bushels we use x = 65, since x is in units of hundreds of million of dollars.

$R'(x)=0.1226\cdot \:65+1.1584\\\\R'(x)=7.969+1.1584\\\\R'(x)=9.1274$

3 0

3 years ago

The number of times a figure coincided with itself as it rotates through 360 is called the BLANK of the rotational symmetry

xenn [34]

It is called the ANGLE of the rotational symmetry:)

5 0

3 years ago

What is the area of the white rectangle in square units

Black_prince [1.1K]

The length above is 13 units.
The length of the grey rectangle below is 4 units, so the length of the white rectangle below is 13 units - 4 units = 9 units.
The width of the white rectangle is 6 units.

A = LW = 9 units * 6 units = 54 units^2

Answer: 54

3 0

3 years ago

River collects old coins. He has four

vlabodo [156]

9514 1404 393

Answer:

c) 5n +25q = 365

2q -4 = n

Step-by-step explanation:

The number of nickels (n) is 4 less than twice the number of quarters (q), so one of the equations is ...

2q -4 = n

The face value is 365 cents, so another equation is ...

5n +25q = 365

These equations seem to match choice C.

5 0

2 years ago