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Verified answer
Y = 5/4 x + 3m = 5/4
syarat tegak lurus
m1 . m2 = - 1
5/4 . m2 = - 1
m2 = - 1 ÷ 5/4
m2 = - 4/5
pers garis yg tegak lurus dg gradien 5/4 harus memiliki gradien - 4/5
cara
a) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( 3 + 1 ) / ( - 4 - 1)
m = 4/ - 5
m = - 4/5 ( benar )
b) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( - 3 - 3 ) / ( - 4 + 2)
m = - 6 / - 2
m = 6/2
m = 3 ( salah)
c) m = ( y2 - y1 ) / ( x2 - x1)
m = ( 3 - 1 ) / ( - 4 - 1 )
m = 2 / - 5
m = - 2/5 ( salah )
d) m = ( y2 - y1 ) / ( x2 - x1)
m = ( 3 + 3 ) / ( - 4 - 2)
m = 6 / - 6
m = - 1 ( salah )
jadi jawabannya = ( A )