%28.4527 setxunit %% 10 mm
28 setxunit
0 8 setxrange
0 3.5 setyrange

%[1 1 .5 .5 .1 .1] {orange} Quadrillage

%tracerepere marks

/A {1 2 } def
/u1 3 def
/u2 0.5 def
/u {u1 u2} def
/M {A u addv} def

/hu1 u1 1.5 mul def
/hu2 u2 1.5 mul def
/hu {hu1 hu2} def
/hM {A hu addv} def

A M droite
A point
M point
hM point

<tex>
$A$
</tex>
A ultexlabel

<tex>
$M$
</tex>
M ultexlabel

<tex>
$h(M)$
</tex>
hM uctexlabel

/v1 u2 4 div def
/vv2  u1 4 div def
/v2 -1 vv2 mul def
/v {v1 v2} def

/tA {A v addv} def
/thM {hM v addv} def

tA thM (->) line

<tex>
$\overrightarrow{Ah(M)} = \alpha \overrightarrow{AM}$
</tex>
5.3 0.8 ultexlabel   {10}