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m = y2-y1 = 1- 10 = -9 =-3
x2-x1 1-(-2) 3
kita masuk ke persamaannya :
y-y1 = m(x-x1)
y - 1 = -3(x- 1)
y - 1 = -3x +3
y = -3x + 3 +1
y = -3x +4
jadi
y = -3x +4
y = -3(3) + 4
y = -9 +4
y = -5
jadi D nya sama dengan -5
semoga membantu yaa^^