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m₁ = - 2
m₂ = 1/2
y - b = m(x - a)
y - 3 = (1/2)(x + 4)
2y - 6 = x + 4
x - 2y + 10 = 0
y = -2x + 6
Karena tegak lurus jd gradiennya (-2 . x = -1) adalah 1/2
Persamaan garisnya adalah
y - 3 = 1/2 (x - (-4))
2 (y - 3) = x + 4
2y - 6 = x + 4
x - 2y = -10
atau
x - 2y + 10 = 0