Question 164818
See the graph below for verification:
{{{drawing(300,300,-6,6,-10,8,grid(1),graph(300,300,-6,6,-10,8,x-4,x+5),circle(1,6,0.20))}}} ---> green line {{{x+5}}} passes on point (1,6)---> Parallel to red line {{{x-4}}} 
Using point (1,6)
{{{Y[2]-Y[1]=m(X[2]-X[1])}}}
{{{Y[2]-6=1(X[2]-1)}}}
{{{Y[2]=X[2]-1+6}}}
{{{Y[2]=X[2]+5}}}, ANSWER ---> Parallel to line {{{x-y=4}}} > {{{y=x-4}}}
Thank you,
Jojo