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m1 = 1/5
(k-1 - 2k)/(-k+1 - k) = 1/5
(-1-k)/(1-2k) = 1/5
1(1-2k) = 5(-1-k)
1 - 2k = -5 - 5k
5k - 2k = - 5 - 1
3k = -6
k = - 2
A(k, 2k)= (-2, - 4)
garis melalui A dengan m =-3
y - y1 = m(x - x1)
y + 4 = -3(x+2)
y +4 = -3x - 6
y = -3x -6-4
y = - 3x - 10
atau
3x + y = - 10
3x + y + 10 = 0