<script src="http://spelprogrammering.nu/simple.js">
function start()
{
  math.axes();
  math.point(-3, 2, 3, "black", "(-3, 2)");
  math.point(3, -1, 3, "black", "(3, -1)");

  math.line(-3, 2, 3, -1, "black");
  math.text(0.4, 0.3, 40, "c");

  math.line(-3, 2, -3, -1, "red");
  math.text(-3.3, 0.4, 40, "a", "green");
  math.line(-3, -1, 3, -1, "red");
  math.text(0.3, -1.35, 40, "b", "green");
}
</script>