Question 914039
I have no idea what you are showing as your steps.


You seem to indicate the system,
{{{system(-5x+4y=-16,x+4y=8)}}}


How do you want graph?  x and y intercepts?   Slope and y-intercept?


{{{4y=5x-16}}}
{{{y=(5/4)x-4}}}


{{{4y=-x+8}}}
{{{y=-x/4+4}}}


You can read the y-intercepts and the slopes.


{{{graph(300,300,-10,10,-10,10,(5/4)x-4,-x/4+4)}}}


Try this on graph PAPER and you may be able to read a satisfactorily accurate value for the intersection point.