Convolution of f(-x) with delta

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i'm struggling with the following convolution:

$\ f(-x,-y)* \delta(x,y-a)$

I don't know if it should be solved that way:

  1. $\ f(-x,-(y-a))=f(-x,-y+a) $

or: (just the shifting)

  1. $\ f(-x, -y-a) $