Solve the System by Graphing $\{ ( 1,1 ) \}$ B) $\{ ( x , y ) \mid y + x = 6 \}$

Solve the system by graphing.
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A) $\{ ( 1,1 ) \}$
B) $\{ ( x , y ) \mid y + x = 6 \}$
C) $\{ ( 1,5 ) \}$
D) $\varnothing$