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x+5=2y
y=1/2x+5/2 gradiennya 1/2
agar tegak lurus, persamaan garis baru dikali 1/2 harus -1
m*1/2=-1, --->m=-2
y-y1=m(x-x1)
y-5=-2(x+1)
y-5=-2x-2
y-5+2x+2=0
y+2x-3=0
y = 1/2 x + 5/2
1/2 . m2 = -1
m2 = -2
y - 5 = -2(x - (-1))
y - 5 = -2(x + 1)
y - 5 = -2x - 2
y = -2x + 3