Solve the System by Substitution $x+y=9$ $5 x+5 y=45$ A) $\{(0,0)\}$ B) $\{(x, y) \mid x+y=9\}$

Multiple Choice

Solve the system by substitution. If the system is inconsistent or has dependent equations, say so.
- $x+y=9$
$5 x+5 y=45$

A) $\{(0,0) \}$
B) $\{(x, y) \mid x+y=9\}$ ; dependent equations
C) $\{(8,1) \}$
D) $\varnothing$ ; inconsistent system