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M = -y/x = -2/4
y - y¹ = m. (x - x¹)
y + 5 = -2/4 . (x - 2)
4y + 20 = -2 . (x - 2)
4y + 20 = -2x + 4
4y + 2x = 4 - 20
4y + 2x = -16
2y + x = -8
3x - 4y = 6
a = 3
b = -4
c = 6
m = -a/b
= -3/-4
= 3/4
2) ax + by = c
4x + 2y = 6
a = 4
b = 2
c = 6
m = -a/b
= -4/2
= -2
m₁ = m₂
-2 = m₂
y - y₁ = m(x - x₁)
y - (-5) = -2(x - 2)
y + 5 = 2x + 4
y = 2x + 4 - 5
y = 2x - 1
Atau dalam bentuk ax + by = c menjadi -2x + y = -1 atau 2x - y = 1