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=3-5 / -3 -(-4)
m = 2.
karena tegak lurus maka
m1 . m = -1. m1 . 2 = - 1. m1 = - 1/2
melalui titik (0 , 6)
y - y1 = m ( x - x1 )
y - 6 = -1/2 (x - 0 )
2y - 12 = x - 0
2y - x - 12 = 0
maka persamaan garisnya = 2y - x - 12 = 0 atau -x +2y - 12 = 0 jawab B