2x + y = 12

x = 9 - 2y

x + 2y = 9

2x + 4y = 20

x + 3y = 16

2x - y = 11

y = 11 - 2x

4x - 3y = - 13

y = 10 + x

-3x + 3y = 30

2x + y = 11

x-2y=-7

x = 2, y = 7

x = 5, y = 2

>

x = 3, y=5

x = 7, y=3

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