x₁ = -150 ; y₁ = 250
x₂ = 250 ; y₂ = 250
(x - x₁) / (x₂ - x₁) = (y - y₁) / (y₂ - y₁)
(x - x₁) (y₂ - y₁) = (y - y₁) (x₂ - x₁)
(x - (-150)) (250 - 250) = (y - 250) (250 - (-150))
(x + 150) (0) = (y - 250) (250 + 150)
0 = 400y - 100000
100000 = 400y
y = 250
Garis lurus sejajar sumbu x di titik y = 250
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x₁ = -150 ; y₁ = 250
x₂ = 250 ; y₂ = 250
(x - x₁) / (x₂ - x₁) = (y - y₁) / (y₂ - y₁)
(x - x₁) (y₂ - y₁) = (y - y₁) (x₂ - x₁)
(x - (-150)) (250 - 250) = (y - 250) (250 - (-150))
(x + 150) (0) = (y - 250) (250 + 150)
0 = 400y - 100000
100000 = 400y
y = 250
Garis lurus sejajar sumbu x di titik y = 250