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(k+1)(3)+2(1)+4 = 0
3k+3+2+4 = 0
3k+9 = 0
3k = -9
k = -3
subtitusi k = -3
(k+1)y+2x+4 = 0
-2y+2x+4 = 0
bentuk umum persamaan garis lurus: y = m.x + c ;(m = gradien)
-2y+2x+4 = 0
2y = 2x+4
y = x+2
maka m = 1 ; gradien garis = 1