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slavikrds [6]
3 years ago
10

Pls help (pic above)

Mathematics
2 answers:
ludmilkaskok [199]3 years ago
7 0

Answer: C

Commutative property of addition.

Step-by-step explanation:

vazorg [7]3 years ago
6 0

Answer:

Line 1 to lin2 2= I think D or maybe A.. Mainly D

line 2 to line 3= A

Step-by-step explanation:

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eduard
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2e=2 solve the question <br><br><br> E=
lukranit [14]

Answer: E=1

Step-by-step explanation:

because 2 times 1 is 2 or any number multiplied by 1 is itself

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3 years ago
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20 POINTS!!! HELP ME!!!! Use the linear combination method to solve the system of equations. Explain each step of your solution.
madreJ [45]

The solution of the system of equations is (-3 , -2)

Step-by-step explanation:

Steps for Using Linear Combinations Method)

  • Arrange the equations with like terms in columns
  • Analyze the coefficients of x or y
  • Add the equations and solve for the remaining variable
  • Substitute the value into either equation and solve

∵ 3 x - 8 y = 7 ⇒ (1)

∵ x + 2 y = -7 ⇒ (2)

- Multiply equation (2) by 4 to make the coefficients of y are equal in

 magnitude and different in sign

∴ 4 x + 8 y = -28 ⇒ (3)

Add equations (1) and (3)

∵ 3 x - 8 y = 7 ⇒ (1)

∵ 4 x + 8 y = -28 ⇒ (3)

∴ 7 x = -21

- Divide both sides by 7

∴ x = -3

Substitute the value of x in equation (2) to find y

∵ x + 2 y = -7 ⇒ (2)

∵ x = -3

∴ -3 + 2 y = -7

- Add 3 to both sides

∴ 2 y = -4

- Divide both sides by 2

∴ y = -2

The solution of the system of equations is (-3 , -2)

Learn more:

You can learn more about the system of the linear equations in brainly.com/question/13168205

#LearnwithBrainly

7 0
3 years ago
An equation and the first step in its solution are shown: Equation: x2 + 8x - 9 = 0
Novay_Z [31]
Answer- A-16

Because when doing completing the square, you divide the coefficient of x by 2, which is 4, and the square it which is 16
3 0
2 years ago
P (-2,6), Q (9,6), R (7, -1), S (-4, -1) are the vertices of a quadrilateral.
vova2212 [387]

Step-by-step explanation:

Parallelogram

Reflect y=-1 ;x changes sign

6 0
3 years ago
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