Question 298860
Y=mX+b
m=4/5, (7,-1)
-1=4/5*7+b
-1=28/5+b
b=-1-28/5
b=(-5-28)/5
b=-33/5 the Y intercept.
Y=4X/5-33/5
{{{ graph( 300, 200, -6, 10, -10, 10, 4x/5 -33/5 ) }}} (graph 300x200 pixels, x from -6 to 10, y from -10 to 10, 4x/5 -33/5).