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m = -9 / -3
m = 3
y = mx - ( mx₁ - y₁ )
y = 3x - ( 3 - 4 )
y = 3x + 1
Titik potong sumbu y, x = 0 :
y = 3x + 1
y = 1
Jadi, titik potong terhadap sumbu y adalah ( 0 , 1 ).