the completion of the system of equations 3x - 5y = 31 dan 2x + y = 12
Mathématiques
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Question
the completion of the system of equations 3x - 5y = 31 dan 2x + y = 12
1 Réponse
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1. Réponse maudmarine
3x - 5y = 31
2x + y = 12
y = 12 - 2x
3x - 5y = 31
3x - 5 (12 - 2x) = 31
3x - 60 + 10x = 31
13x = 31 + 60
13x = 91
x = 91/13
x = 7
2x + y = 12
2 (7) + y = 12
14 + y = 12
y = 12 - 14
y = - 2
Les solutions du système sont : (7 ; - 2)