Identify Systems That Do Not Have Exactly One Ordered-Pair Solution $$y = \frac { 1 } { 2 } x + 3$$

Multiple Choice

Identify Systems That Do Not Have Exactly One Ordered-Pair Solution
- $$y = \frac { 1 } { 2 } x + 3$$
$$x - 2 y = - 6$$

A) $\{ ( - 6,0 ) \}$
B) $\{ ( 0,3 ) \}$
C) $\{ ( x , y ) \mid x - 2 y = - 6 \}$
D) $\varnothing$