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m = -1-7/2-4
m = -8/-2
m = 4
lalu masukkan kerumus persamaan garis :
y-y1 = m (x-x1)
y-7 = 4(x-4)
y-7 = 4x -16
y = 4x -16+7
y = 4x -9
Diket : x = -3
y = 4(-3) - 9
y = -12 - 9
y = -21
k = y = -21