[填空题]
The equation of a cu8. gs*bi+42n ayrxbrb3 ubu9qrv;jx-u,/ r)g irskw+mse is y=1-$\frac{9}{x}$.
1.Find the equation of the tangent to the curve at x=3.
y=ax-b;a= , b= .
2.Find the coordinates of the points on the curve where the gradient is $\frac{1}{4}$.
the points are (a,-$\frac{b}{2}) and (-6,$\frac{c}{d}$).
a= , b= , c= , d= .