Question 907419
(f + g)(x) = (x+4)/(x+5) (−∞, 5) U (5, ∞)
{{{drawing(300,300,   -10,10,-10,10, blue(line(-5,10,-5,-10 )),    
 grid(1),

graph( 300, 300, -10,10,-10,10,0,1, (x+4)/(x+5)))}}}