Question

Persamaan garis (k - 1)x + (k + 1)y + 2k = 0
berampit dengan garis 2x + 3y + 5 = 0,
maka nilai K adalah..........

Answer 1

Berampit berarti gradiennya bernilai sama
m = −a/b
m = −(k − 1)/(k + 1) = −2/3

−(k − 1)/(k + 1) = −2/3

Kali silang

−3(k − 1) = −2(k + 1)
−3k + 3 = −2k − 2
−3k + 2k = −2 − 3
−k = −5
k = 5