Solve $x - 3 y - 7 = 0$
$3 x - 3 y = 15$

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Solution

$x - 3 y = 7$
$3 x - 3 y = 15$
$-$ $+$ $-$
_____________
$- 2 x = - 8$
$x = 4$
Substitute $x = 4$ in $x - 3 y = 7$ , we get
$4 - 3 y = 7$
$3 y = 4 - 7$
$3 y = - 3$
$y = - 1$

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