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m = 1/2
m₂ = -2
y = -2x - ( -4 - 5 )
y = -2x + 9
2x + y - 9 = 0
x +4 = 2y
2y = x +4
y = 1/2x +4/2
y = 1/2x +2
Maka, m₁ = 1/2
m₁ . m₂ = -1
1/2 . m₂ = -1
m₂ = -1 per 1/2
m₂ = -2
y -y₁ = m(x -x₁)
y -5 = -2(x -2)
y -5 = -2x +4
y = -2x +4 +5
y = -2x +9
2x +y -9 = 0
Jadi, jawabannya adalah a.
Itu jawabannya.