$\begin{array}{1 1}(a)\;t_1=-t_2-\large\frac{2}{t_2}\\(b)\;t_2=-t_1-\large\frac{2}{t_1}\\(c)\;2t_1=-3t_2-\large\frac{2}{t_2}\\(d)\;4t_1=-t_2-\large\frac{3}{t_2}\end{array}$