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m1 = -4/-3 = 4/3
karena tegak lurus maka :
m1 .m2 = -1
4/3 .m2 = -1
m2 = -3/4
persamaan garis :
y - y1 = m2 (x - x1)
y - (-3) = -3/4 (x - (-3))
y + 3 = -3/4 (x +3)
y + 3 = -3/4x -9/4 ...(dikalikan 4)
4y +12 = -3x -9
3x +4y +12 +9 = 0
3x +4y +21 = 0
semoga membantu