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Sagot :

MAUDMARINE

Bonjour

x+3y = 1

-2x-y=3

x = 1 - 3y

- 2 (1 - 3y) - y = 3

- 2 + 6y - y = 3

6y - y = 3 + 2

5y = 5

y = 5/5

y = 1

x + 3y = 1

x + 3 * 1 = 1

x + 3 = 1

x = 1 - 3

x = - 2

S = [- 2 ; 1]

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