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y -(-1) = 1/2(x -0)
y +1 = 1/2x
y = 1/2x -1
b) y -y₁ = m(x -x₁)
y -3 = -1(x -0)
y -3 = -x
y = -x +3
2. a) y -y₁ = m(x -x₁)
y -9 = 3/5(x -5)
y -9 = 3/5x -3
y -9 = 3/5x -3
5y -45 = 3x -15
5y = 3x -15 +45
5y = 3x +30
b) y -y₁ = m(x -x₁)
y -3 = -1/2(x -6)
y -3 = -1/2x +3
2y -6 = -x +6
2y = -x +6 +6
2y = -x +12
3. Maaf yang no. 3 kurang jelas gambarnya.