Line P P\,P passes through the points (−4,2)(-4, 2)(−4,2) and (2,0)(2, 0)(2,0). Line Q Q\,Q passes through the points (1,−2)(1, -2)(1,−2) and (2,k)(2, k)(2,k). Given that Line P P\,P is perpendicular to Line QQQ, find the value of kkk.
