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m1 = -2/-3 = 2/3
karena tegak lurus maka
m1 .m2 = -1
2/3 .m2 = -1
m2 = -3/2
persamaan
y - y1 = m2 ( x-x1 )
y - 4 = -3/2 (x - (-3))
y -4 = -3/2(x +3)
y -4 = -3/2x -9/2 ...(dikalikan 2)
2y-4 = -3x -9
3x +2y +5 = 0