Question

e)
9x+y=6
3x – 2y=-5
sistemas de equações​

Answer 1

Resposta:

acho q ta errado isso ae

Answer 2

Resposta:

$\sf \left\{\begin{array}{lI} 9x + y = 6 \\3x -2y = - 5\end{array}\right$

$\sf \left\{\begin{array}{lI} 9x + y = 6 -9x \\3x -2y = - 5\end{array}\right$

$\sf 3x -2y = - 5 \\3x - 2(6 -9x) = -5 \\3x - 12 + 18x = - 5 \\3x + 18x = - 5 + 12\\21x = 7 \\\\x = \dfrac{7\div 7}{21\div 7} \\\\\boxed{ x = \dfrac{1}{3} }$

Calcular o valor de y:

$\sf 9x + y = 6 \\\\9\times \dfrac{1}{3} + y = 6 \\\\\dfrac{9}{3} + y = 6 \\\\3 + y = 6 \\y = 6 - 3\\\\\boxed{ y = 3 }$

Explicação passo-a-passo:

Usar o método da substituição.