Question 316824
Add the two equations together.
1.{{{3x-4y=9}}}
2.{{{-3x+4y=12 }}}
{{{3x-4y-3x+4y=9+12}}}
{{{0=21}}}
This is an inconsistent system.
The lines are parallel and never meet.
There is no solution. 
{{{ graph( 300, 300, -10, 10, -10, 10, (9-3x)/(-4),(12+3x)/4) }}}