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x +y = 10
y = -x +10
Maka, m₁ = -1
m₁ . m₂ = -1
-1 . m₂ = -1
m₂ = 1
y -y₁ = m(x -x₁)
y -(-3) = 1(x -2)
y +3 = x -2
y = x -2 -3
y = x -5
Itu jawabannya.