Solve the following system of equations using a matrix method: $\displaystyle {\left\lbrace\begin{array}{ccccc} {x}&+&{2}{y}&=&-{4}\\{3}{x}&+&{5}{y}&=&-{6}\end{array}\right.}$ 

You may use any matrix method.  If you use your calculator, make sure it's clear what you did in the calculator.

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