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maaf klo slh
B(4,9) ⇒ X2 = 4, Y2 = 9
m (gradien) ⇒ Y2-Y1 /(per) X2-X1 = 9-4 /(per) 4-3 = 5/1 = 5
Jadi, jawabannya adalah 5
Semoga membantu :)