Question 1042186
The reason is that they are the same equation!
(1) {{{ 5x - 4y = 1 }}}
(2) {{{ 10x - 8y = 2 }}}
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If you multiply both sides of (1) by {{{ 2 }}},
then you get (2) 
( you haven't changed (1) AT ALL, by doing that )
OR
If you divide both sides of (2) by {{{ 2 }}}, then
you get (1)
( again, you haven't changed (2) the least bit )
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When you are comparing 2 linear equations like this,
the possibilities are:
(1) They are the same equation
(2) They are parallel equations
(3) They intersect at some point
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Hope this helps