Question 840192
{{{y=( 1/2)x + 3}}}

{{{y= 4x - 11}}}
I changed from a,b to x,y so the graphs correspond.
{{{drawing(300,300,-1,7,-1,7,grid(1),circle(4,5,0.12),
graph(300,300,-1,7,-1,7,(1/2)x+3,4x-11))}}}