Edit in JSFiddle

var chart = c3.generate({
  bindto: "#linechart",
  data: {
    columns: [
      ['data1', 30, 200, 100, 400, 150, 250],
      ['data2', 50, 20, 10, 40, 15, 25]
    ]
  }
});

<div id="linechart"></div>