Determine whether the following system has no solution, an infinite number of solutions or a unique solution.

Select Answer No Solution Infinite Solutions Unique Solution  1. $\left\lbrace\begin{array}{rllrrr} 7 x & - 5 y &= &9 \cr -4 x &+ 5 y &= &9 \cr -9 x &+ 15 y &= &45 \end{array} \right.$

Select Answer No Solution Infinite Solutions Unique Solution  2. $\left\lbrace\begin{array}{rllrrr} 7 x & - 5 y &= &9 \cr -4 x &+ 5 y &= &9 \cr -9 x &+ 15 y &= &47 \end{array} \right.$

Select Answer No Solution Infinite Solutions Unique Solution  3. $\left\lbrace\begin{array}{rllrrr} -10 x & - 10 y &= &-20 \cr -6 x & - 6 y &= &-12 \cr -14 x & - 14 y &= &-28 \end{array} \right.$