Respuesta :

HomertheGenius
The system:
- 12 c + 3 d = 6
- 3 c + 6 d = - 9
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The 1st equation:
- 12 c = - 3 d + 6  / * ( - 1) ( multiple both sides by -1 )
12 c = 3 d - 6  /  : 12  ( divide both sides by 12 )
c = d / 4 - 1/2
Answer:
C ) c = 1/4 d - 1/2