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Modulus of a Complex Number

Solve: x+3y=...

Question

Solve:
$x + 3 y = 0 3 x + y = 8$

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Solution

$x + 3 y = 0$

$\Rightarrow$ $x = - 3 y$

$\Rightarrow$ $3 x + y = 8$

$\Rightarrow$ $3 (- 3 y) + y = 8$

$\Rightarrow$ $- 9 y + y = 8$

$\Rightarrow$ $y = 1$

$⟹ x = - 3$

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