Question 902960
(4,2), slope - 1/5

y=mx+b is the equation of a line

equation  --- 
2 = (-1/5)*4+c

2=-4/5 +c

c=2+4/5

=14/5

y=(-1/5)x+14/5

{{{drawing(300,300,-10,10,-10,10,grid(1),graph(300,300,-10,10,-10,10,y=(-1/5)x+14/5))}}}