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a=-6
b=2k-1
gradien h1 adalah
m1 = -b/a = -(2k-1)/(-6) = (2k-1)/6
h2 : (-3k-1)x+12y = 50
a=12
b=-3k-1
gradien h2 adalah
m2 = -b/a = -(-3k-1)/12 = (3k+1)/12
karena sejajar, maka gradien garis h1 sama dengan gradien garis h2
m1 = m2