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Verified answer
Bab Persamaan GarisMatematika SMP Kelas VIII
y = -3x
m1 = -3
tegak lurus
m1 . m2 = -1
(-3) . m2 = -1
m2 = -1/-3
m2 = 1/3
Uji Pilihan
a] y = 2x - 1
m = 2
b] y = -8x + 6
m = -8
c] y = 3x - 9
m = 3
d] y = 1/3 . x - 4
m = 1/3 → jawaban yang benar
e] y = -1/3 . x + 5
m = -1/3
✩✩ D ✩✩