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y - 4 = 5(x - 0)
y - 4 = 5x - 0
y - 4 = 5x
y = 5x + 4
b) y - y₁ = m(x - x₁)
y - (-1) = 1/2(x - 4)
y + 1 = 1/2x - 2
y = 1/2x - 2 - 1
y = 1/2x - 3