Answer
$\det EA=(\det E)(\det A)$$\star$
Work Step by Step
$(\det E)(\det A)=(1-0)(ad-bc)=ad-bc$
$\det EA=\begin{vmatrix}a+kc&b+kd\\c&d\end{vmatrix}=(a+kc)d-(b+kd)c=ad+kcd-bc-kcd=ad-bc$
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