input courbescp13;

beginfig(1);
  cadre((0,0),(10,13));
  origine((1,0.5));
  unites(2,1);
  draw grille(0.5) withcolor bleu;
  draw axes withpen pencircle scaled 1.5bp;
  graduationx(btex 1 etex,1);
  graduationy(btex 1 etex,1);
  draw courbe1(0,4,2,-2*x+12);
  draw labelise1(btex $y=-2x+12$ etex,0.15);
endfig;
end