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4y = -x +1
y = -1/4x +1/4
maka, m₁ = -1/4
m₁ . m₂ = -1
-1/4 . m₂ = -1
m₂ = -1 per -1/4
m₂ = 4
y -y₁ = m(x -x₁)
y -7 = 4(x -(-5))
y -7 = 4x +20
y = 4x +20 +7
y = 4x +27
4x -y +27 = 0
Jadi, persamaannya adalah 4x -y +27 = 0
Pers garis =
y -7 = 4( x+5)
y-7 = 4x + 20
y- 4x = 20 + 7
y - 4x -27 = 0