Solve by the Substitution Method $-7 x+9 y=21$ $2 \mathrm{x}+6 \mathrm{y}=-6$

Multiple Choice

Solve by the substitution method.
- $-7 x+9 y=21$
$2 \mathrm{x}+6 \mathrm{y}=-6$

A) $(-4,1)$
B) No solution
C) $(-3,1)$
D) $(-3,0)$