Solve the System by the Substitution Method $x^{2}+y^{2}=1$ $\mathrm{x}+\mathrm{y}=-1$ A) $\{(0,-1),(-1,0)\}$ B) $\{(0,1),(1,0)\}$

Multiple Choice

Solve the system by the substitution method.
- $x^{2}+y^{2}=1$
$\mathrm{x}+\mathrm{y}=-1$

A) $\{(0,-1) ,(-1,0) \}$
B) $\{(0,1) ,(1,0) \}$
C) $\{(0,-1) ,(1,0) \}$
D) $\{(0,1) ,(-1,0) \}$