Question

As coordenadas do ponto de interseção das retas. r: x + 4y – 7 = 0 e s: 3x + y + 1 = 0.

Answer 1

Resposta:

$\textsf{Leia abaixo}$

Explicação passo a passo:

$\begin{cases}\mathsf{x + 4y - 7 = 0}\\\mathsf{3x + y + 1 = 0}\end{cases}$

$\mathsf{x = -4y + 7}$

$\mathsf{3(-4y + 7) + y + 1 = 0}$

$\mathsf{-12y + 21 + y + 1 = 0}$

$\mathsf{-11y = -22}$

$\boxed{\boxed{\mathsf{y = 2}}}$

$\mathsf{x = -4(2) + 7}$

$\mathsf{x = -8 + 7}$

$\boxed{\boxed{\mathsf{x = -1}}}$