Simultaneous Equations by elimination

Elimination

100

x + 3y = 5

-x - y = -3

x = 2 , y = 1

200

x - 2y = -7

3x + 2y = 3

x = -1, y = 3

300

2x + 7y = 1

2x - 4y = 12

x = 4, y = -1

400

 5x - y = 21

-7x + y = -15

x = -3, y = 6

500

8x - y = - 3

8x + 4y = 12

x = 0, y = 3

Elimination - addition

100

4x + 9y = 29

6x - 9y = 21

x = 5, y = 1

200

2x - 2y = -18

5x + 2y = -24

x = -6, y = 3

300

-8x - 5y = 18

8x + 7y = -22

x = -1, y = -2

400

5x - 4y = -8

-5x + 6y = 12

x = 0, y = 2

500

4x - 5y = 7 

-8x + 5y = 1

x = -2, y = -3

Elimination - subtraction

100

x + 5y = 13

x + y = -3

x = -7, y = 4

200

-2x + 4y = 8 

x + 4y = 26

x = 6, y = 5

300

-5x - 6y = 14 

3x - 6y = -18

x = -4, y = 1

400

-8x + 2y = 28

-8x - 7y = 10

x = -3, y = 2

500

-2x - 4y = 8

-5x - 4y = -10

x = 6, y = -5