print particular lines question

[ToddAndMargo via perl6-users]

Hi All,

I seems I should know how to do this, but
I am drawing a blank.

$ cat Lines.txt | raku -ne 'say $_;'
Line 1
Line 2
Line 3
Line 4
Line 5
Line 6
Line 7
Line 8
Line 9
Line 10
Line 11


I want to print liens 1, 3, and 7.

Assigning  `my @x=$_.lines` puts everything into $x[0]


Many thanks,
-T