Question

Alguém sabe até às 11

Answer 1

Resposta:

Alternativa C.

Explicação passo-a-passo:

$\left \{ {{3x-4y=\ \ 2\ \ \ \ \ \ \ \ \ \ \ \ \ \ } \atop {-2x+y=-3\ \rightarrow y=-3+2x}} \right. \\\\3x-4y=2\\3x - 4\times(-3+2x)=2\\3x +12-8x=2\\-5x=2-12\\-5x=-10\\x=\dfrac{-10}{-5}=2\\\\\boxed{\bf{x=2}}\\\\y=-3+2x = -3+2\times(2) = -3+4 = +1\\\\\boxed{\bf{y=1}}\\\\\\\boxed{\bf{S=\{2,1\}}}$

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