Solve by the Substitution Method $x+y=9$ $2 x+2 y=18$ A) $(0,0)$ B) Infinite Number of Solutions
C)

Multiple Choice

Solve by the substitution method.
- $x+y=9$
$2 x+2 y=18$

A) $(0,0)$
B) Infinite number of solutions
C) $(9,0)$
D) $(9,2)$