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2y=-3x-5
y=(-3/2)x-(5/2)
m1 = -3/2
karena tegak lurus ax-6y+9=0 maka m1.m2 = -1
sehingga m2 = 2/3
ax-6y+9=0
6y=ax+9
y=(a/6)x+(9/6)
gradien garis ax-6y+9=0 (m2) adalah a/6
sehingga
a/6=2/3
a = (2/3).6
a=4