Question

${-x+ 2y = -3 5x-2y=7$

Answer 1

Resposta:

$(x,y)= ( - \frac{7}{18} ,\frac{119}{36})$

Explicação passo-a-passo:

$-x+2y= -35x-2y=7\\\left \{ {{-x+2y=7} \atop {-35x-2=7}} \right.\\- 36x=14\\x=\frac{7}{18} \\\-(-\frac {7}{18}) +2y=7\\y=\frac{119}{36} \\(x.y) = ( -\frac{7}{18} ,\frac{119}{36} )\\ - ( - \frac{7}{18} )+2. \frac{119}{36} = - 35. (\frac{7}{18} ) -2.\frac{119}{36} =7\\7=7=7\\(x,y)= ( - \frac{7}{18} ,\frac{119}{36})$