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y = -2x +5
maka, m₁ = -2
m₁ . m₂ = -1
-2 . m₂ = -1
m₂ = -1/-2
m₂ = 1/2
y -y₁ = m(x -x₁)
y -3 = 1/2(x -4)
y -3 = 1/2x -4/2
y -3 = 1/2x -2 dikali 2 untuk mwnghilangkan penyebut, sehingga
2y -6 = x -4
2y = x -4 +6
2y = x +2
Jadi, persamaannya adalah 2y = x +2 atau x -2y +2 = 0
= -2/1
=-2
-2 x 1/2 = -1
m2 = 1/2
y-y1= m(x-x1)
y-3 = 1/2(x-4)
y-3=1/2x- 2
y=1/2x-2+3
y=1/2x+1
2y-x-1=0