k: -3x+y-4=0
k: y=3x+4
l || k ⇔ l: y=3x+b
P ∈ l ⇔ -4=-3+b
b=-1
l: y=3x-1
y=3x+4
a=3
y=3x+b
-4=-1*3+b
-1=b
y=3x-1
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k: -3x+y-4=0
k: y=3x+4
l || k ⇔ l: y=3x+b
P ∈ l ⇔ -4=-3+b
b=-1
l: y=3x-1
y=3x+4
a=3
y=3x+b
-4=-1*3+b
-1=b
y=3x-1