3y-x+3=0
m1=-a/b
m1=1/3
m1×m2=-1
1/3×m2=-1
m2=-1:1/3
m2=-3
(2,-1)
y-y1=m (x-x1)
y-(-1)=-3 (x-2)
y+2=-3 (x-2)
y+2=-3x+6
3x+y+2-6=0
3x+y-4=0
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3y-x+3=0
m1=-a/b
m1=1/3
m1×m2=-1
1/3×m2=-1
m2=-1:1/3
m2=-3
(2,-1)
y-y1=m (x-x1)
y-(-1)=-3 (x-2)
y+2=-3 (x-2)
y+2=-3x+6
3x+y+2-6=0
3x+y-4=0