Answer
The two equations/lines $coincide$ (overlap). Infinite solutions.
Work Step by Step
We use the addition method below:
We add the two equations:
$2x-5y=8$
$4x-10y=16$
Multiply both sides of the first equation by $-2$ to cancel $x$.
$-4x+10y=-16$
$\underline{+4x-10y=+16}$
$0=0$
This is a true statement, which means that we have infinite solutions.
So the two equations/lines coincide (overlap).
