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y=4-x
-x-y+4=0
A=-1 B=-1 C=4
|Ax₀+By₀+C|/√(A²+B²)
|(-1)*0+(-1)*0+4|/√((-1)²+(-1)²)
|4|/√(1+1)
4/√2
(4√2)/2
2√2