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Multiply -1
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100

 4x - 3y = 5 

-2x + 3y = -7

What is (-1, -3)

100

7x - 2y = 5

7x - 3y = 4

What is (-1, 1)

100

4x + y = 5

2x + 5y = 7

What is (3, -3)

200

-5x - 6y = 8

5x + 2y = 4

What is (2, -3)

200

4x + 2y = 14 

4x - 3y =-11

What is (1, 5)

200

8x - 5y = 11

4x - 3y = 5

What is (2, 1)

300

6x - 4y = 14 

-3x + 4y = 1

What is (5, 4)

300

4x - 9y = -21

4x + 3y = -9

What is (-3, 1)

300

4x + 2y = 12

2x + 2y = 0 

(6, -6)

400

x + 2y = 13

-x + y = 5

What is (1, 6)

400

6x + y = -10

5x + y = -10

What is (0, -10)

400

2x - y = -14

 -3x+y = 6

What is (8, 30)

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