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m = 2
pers garis dgn m = 2 melalui titik (2,-1):
y - y₁ = m (x - x₁)
y - (-1) = 2 (x-2)
y + 1 = 2x - 4
y = 2x - 4 - 1
y = 2x - 5
semoga membantu ya :)
y = mx - ( mx₁ - y₁ )
y = 2x - ( 4 + 1 )
y = 2x - 5