Can you prove E_{ij}AE_{kl}=a_{jk}E_{il} with the given formula for A?

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matrix -- proving need help!

please help i have no idea how to do this question. please give me some hints :(
 
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Part (a) is asking you to show that [itex]E_{ij}AE_{kl}=a_{jk}E_{il}[/itex], and it's giving you a formula for A. So why don't you start by writing [itex]E_{ij}AE_{kl}=[/itex], and then use the formula for A that you were given?
 
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