Write the Word or Phrase That Best Completes Each Statement $$\begin{array} { l } a _ { 1 } x + b _ { 1 } y = c _ { 1 } \\a _ { 2 } x + b _ { 2 } y = c _ { 2 }\end{array}$$

Write the word or phrase that best completes each statement or answers the question.
Provide the missing information.
-Suppose that the given system has one solution.
$$\begin{array} { l } a _ { 1 } x + b _ { 1 } y = c _ { 1 } \\a _ { 2 } x + b _ { 2 } y = c _ { 2 }\end{array}$$
Cramer's rule gives the solution as $x = \frac { \square } { \square }$ and $y = \frac { \square } { \square }$ where $D = \left| \begin{array} { l } \square \square \\ \square \square \end{array} \right| , D _ { x } = \left| \begin{array} { l } \square \square \\ \square \square \end{array} \right|$ , and $D_{y}=\left|\begin{array}{l}\square \square \\\square \square\end{array}\right|$