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3 x + 4 y = 5

6 x + 2 y = 1

- 6 x - 8 y = - 10

6 x + 2 y = 1

- 6 y = - 9

y = 9/6 = 3/2

3 x + 4 *3/2 = 5

3 x + 12 /2 = 5

3 x = 5 - 6

3 x = - 1

x = - 1 /3

S ( - 1/3 : 3/2 )

Vérification

6 * - 1/3 + 2 * 3/2 = 1

- 6 /3 + 6/2 = 1

- 2 + 3 = 1

2 x /3 - 4 y = 2

- x + 6 y = - 3

6 x /3 - 12 y = 6

- x + 6 y = - 3

- 6 y = 3

y = - 3 /6 = - 1/2

- x + 6 * - 1/2 = - 3

- x = - 3 + 6/2

- x = - 3 + 3 = 0

S ( 0 ; - 1/2 )

Vérification

2 x /3 - 4 y = 2

0 - 4 * - 1/2 = 2

4/2 = 2

2 = 2

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