Question 720589
{{{1=7y-4x}}}
{{{4x+1=7y}}}
{{{highlight(4x-7y=-1)}}}


{{{8x-4-14y=0}}}
{{{8x-14y=4}}}
{{{highlight(4x-7y=2)}}}


The reason that you have trouble is these two equations represent parallel lines in a plane.  They will not intersect.