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(-5,1) X1= -5 , Y1 = 1
3x-6y=12 -> a=3 , b=6
m = -a/b
= -3/6
= - 3/6
= - 1/2
y-y1=m(x-x1)
y-1=- 1/2(x+5)
(y-1= - 1/2x - 5/2 ) .2
2y-2=-x -5
2y = x-5+2
2y =x -3
Maaf kalau salah ^_^
x= -5
y= 1
tegak lurus dengan 3x-6y=12
m(gradien)= -a/b = -3/-6=3/6=1/2
y-y1 =-1/m(x-x1)
y-1= -1/ 1/2 (x-(-5))
y-1=-1/2x-5/2
y=-1/2x-5/2+1
y=-1/2x -5/2 + 2/2
y=-1/2x - 3/2
pengecekan
y=-1/2x-3/2
1= -1/2(-5) - 3/2
1= 5/2 -3/2
1= 2/2
1=1
jadi jawabannya y=-1/2x-3/2