Find an equation for the line tangent to the curve at the point defined by the given value of t. Also, find the value of

d2y/dx2

at this point.

x=1/t+7,

y=t/t7,

t=8

Write the equation of the tangent line.

y=

(Simplify your answers. Use integers or fractions for any numbers in the expression.)

What is the value of

d2y/dx2

at this point?

d2y/dx2=enter your response here

(Type an integer or a simplified fraction.)