How do you solve x-y=-5  and x+4=16  using substitution?

$x = 12 \mathmr{and} y = 17$
Equation(2): $x = 16 - 4 = 12$ Substituting $x = 12$ in the equation(1) $12 - y = - 5 \mathmr{and} y = 12 + 5 = 17$[Ans]