Question 149239
2x=y+1
Y=2X-1 (RED LINE)
2x-y=5
Y=2X-5 (GREEN LINE)
{{{ graph( 300, 200, -6, 5, -10, 10, 2x -1, 2x -5) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions 2x -1 and 2x -5). 
THSE PARALLEL LINES INDICATE THAT THERE IS NO S0LUTION TO THESE 2 EQUATIONS.