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= -10/15
= -2/3
B(-5,-5) -----> X2,Y2
untuk mencari gradien,
y - y1 / y2 - y1 = x - x1 / x2 -x1
y - 5 / -5 - 5 = x - (-10) / -5 - (-10)
y -5 / -10 = x + 10 / 5
5y - 25 = -10x - 100
5y = -10x - 100 + 25
5y = -10x - 75
y = -2x - 75/5
jadi, m = -2 (gradien yang melekat pada variabel x)