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1. ...
jadi m= -5
2. ...
3. ...
persamaan garis singgung dengan m=-5 melalui titik (-1,-4) adlah:
y - y1 =m.(x-x1)
y - (-4)= -5.(x - (-1))
y+4 = -5.(x+1)
y+4 = -5x- 5
y= -5x- 9