%Gilles Mora
40 setxunit
7.5 setborder
90 setangle_repere
-4 4.5 setxrange
-3 5 setyrange
1 1 settkstep
.5 .5 setsubtkstep
2 2 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
%unites
/f {setxvar
#rpn#   x+1+2/(x-5)
} def
/g {setxvar
#rpn#   x+1
} def
gsave
   noir
   .75 setlinewidth
   continu
   {f} courbe
grestore
gsave
   noir
   .75 setlinewidth
   continu
   {g} courbe
grestore



<latex>
$y=ax+b$
</latex>
boxit
2.1 5 [1.5 dup] dctexlabel

<latex>
$C_f$
</latex>
boxit
3.8 2 [1.5 dup] dctexlabel