Question

X-3 = y-7
3x + y = 12

Answer 1

$\bf{ANSWER :-}$

$= > x - 3 = y - 7$

Solving Lhs

$= > x - 3$

$= > x = 3$

Solving rhs

$= > y - 7$

$= > y = 7$

$= > 3x + y = 12$

$= > y = \frac{12}{3x}$

$= > y = 4x$