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m = -a/b
= -4/-3 = 4/3
Syarat tegak lurus : m1.m2 = -1
m1.m2 = -1
4/3 . m2 = -1
m2 = -3/4
PGL melalui garis 2,-7 dengan gradiennya -3/4
y = mx+c
-7 = -3/4 ( 2 ) + c
-7 = -3/2 + c
-7 + 3/2 = c
-11/2 = c
Jadi, y = -3/4x -11/2 atau 3x+4y+22 = 0
Maaf kalau salah