Explicação passo-a-passo:
[tex]2x + y = 1 \\ 7x + 8y = 19[/tex]
[tex] - 16x - 8y = - 8 \\ 7x + 8y = 19 \\ = = = = = = = = = = \\ - 9y = 11 \\ 9y = - 11 \\ y = - \frac{11}{9} [/tex]
[tex]2x + y = 1[/tex]
[tex]2x - \frac{11}{9} = 1[/tex]
[tex]2x = 1 + \frac{11}{9} [/tex]
[tex]2x = \frac{20}{9} [/tex]
[tex]x = \frac{20}{9} \: . \: \frac{1}{2} [/tex]
[tex]x = \frac{10}{9} [/tex]
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Explicação passo-a-passo:
[tex]2x + y = 1 \\ 7x + 8y = 19[/tex]
[tex] - 16x - 8y = - 8 \\ 7x + 8y = 19 \\ = = = = = = = = = = \\ - 9y = 11 \\ 9y = - 11 \\ y = - \frac{11}{9} [/tex]
[tex]2x + y = 1[/tex]
[tex]2x - \frac{11}{9} = 1[/tex]
[tex]2x = 1 + \frac{11}{9} [/tex]
[tex]2x = \frac{20}{9} [/tex]
[tex]x = \frac{20}{9} \: . \: \frac{1}{2} [/tex]
[tex]x = \frac{10}{9} [/tex]