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3x - 12 = 3:12=4 jadi x =4 3(4)
y + 12 = y =12
jadi jawaban nya 3(4) - 12 +12 =0
kalau gak salah
M1=-a/b
M1=-3/-1
M1=3
Y-Y1=M(X-X1)
Y-(-1)=3(X-4)
Y+1=3X-12
3X-Y=1+12
3X-Y=13
3X-Y-13=0