Question 855808
1.{{{2x-5y=3}}}
2.{{{-4x+10y=3}}}
Divide eq. 2 by (-2),
{{{2x-5y=-3/2}}}
Which has a left hand side exactly like eq. 1 but with a different right hand side. 
This means these lines are parallel and there is no solution (since the lines never intersect).