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-2x + 3y + 4 = 0 ⇒ 3y = 2x - 4 ⇒ y = 2/3 x - 4/3
maka m1 = 2/3
2kx + y + 13 = 0 ⇒ y = -2kx - 13
maka m2 = -2k
karena m1 = m2, maka
m1 = m2
⇒ 2/3 = -2k
⇒ 1/3 = -k
⇒ k = -1/3
jadi nilai k agar sejajar adalah k = -1/3