y=e^-9t at t=0
Is the point (0,0)? Please chk if the question is complete
the question doesn't specify if the point is (0,0)
You need a point of line to determine the equation of the tangent. From the above information, you can find only the slope of the line
ok i guess thats what they are looking for then?
Slope m is
y' = -9e^-9t
at t =0 Slope m is y =-9
Now you need the point to find the equation of the line
-9 is the slope of the tangent line
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