Find the value of kkk such that the lines given by 3x+ky=73x + ky = 73x+ky=7 and x−2y=3x - 2y = 3x−2y=3 are perpendicular.
k=−6k = -6k=−6
k=−1.5k = -1.5k=−1.5
k=1.5k = 1.5k=1.5
k=6k = 6k=6