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y - y₁ = x - x₁
y₂ - y₁ x₂ - x₁
y - 2 = x - 1
0 - 2 2 - 1
y - 2 = x -1
-2 1
1(y-2) = -2(x-1)
y - 2 = -2x + 2
y = -2x +2 +2
y = -2x + 4
Titik C (3,p) terletak pada garis y = -2x +4
y = -2x + 4
p = -2 x 3 + 4
p = -6 + 4
p = -2