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= -7/4
m₁ = m₂
-7/4 = -7/4
Persamaan ~> y - y₁ = m(x - x₁)
y - (-12) = -7/4(x - (-8)
y + 12 = -7/4(x + 8)
y + 12 = -7/4x - 56/4
4y + 48 = -7x - 56
4y = -7x - 56 + 48
4y = -7x - 8
y = -7/4x - 2
b) m₁ = -a/b
= -3/1
= -3
m₁ = m₂
-3 = -3
Persamaan ~> y - y₁ = m(x - x₁)
y - (-4) = -3(x - 3)
y + 4 = -3x + 9
y = -3x + 9 - 4
y = -3x + 5
c) y - 2x = 3
y = 2x + 3
Maka, m₁ = 2
m₁ = m₂
2 = 2
Persamaan ~> y - y₁ = m(x - x₁)
y - 1 = 2(x - 3)
y - 1 = 2x - 6
y = 2x - 6 + 1
y = 2x - 5