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 d2 ydx2 at this point. x = 1 t+5, y = tt−5, t = 6 Write the equation of the tangent line. y = x − (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 = (Type an integer or a simplified fraction. )