Mathématiques

Question


3x+2y= -8
-12x+7y= 17

1 Réponse

  • 4(3x+2y) = -8
    -12x+7y = 17

    12x+8y = -32
    -12x+7y = 17

    15y = -15
    y = -1

    3x+2y = -8
    3x-2 = -8
    3x = -6
    x =-2

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