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a = 1/2
b = 2/3
Maka gradien garis = -a/b
1/2
= -----
2/3
= 1/2 . 3/2
= 3/4
Syarat garis tegak lurus
m₁ . m₂ = - 1
3/4 . m₂ = - 1
- 1
m₂ = ------
3/4
m₂ = - 1 . 4/3
= -4/3
maka,
a = 1/2 dan b = 2/3
jadi,
gradien (m) tegak lurus
= b/a
= (2/3)/(1/2)
= 2/3 x 2/1
= 4/3 atau 1 1/3