Get your own website Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
<body>
<div id="myPlot" style="width:100%;max-width:700px"></div>
<script>
const xArray = [50,60,70,80,90,100,110,120,130,140,150];
const yArray = [7,8,8,9,9,9,10,11,14,14,15];
// Calculate Slope
let xSum = xArray.reduce(function(a, b){return a + b;}, 0);
let ySum = yArray.reduce(function(a, b){return a + b;}, 0);
let slope = ySum / xSum;
// Generate values
const xValues = [];
const yValues = [];
for (let x = 50; x <= 150; x += 1) {
  xValues.push(x);
  yValues.push(x * slope);
}
const data = [
  {x:xArray, y:yArray, mode:"markers"},
  {x:xValues, y:yValues, mode:"line"}
];
const layout = {
  xaxis: {range: [40, 160], title: "Square Meters"},
  yaxis: {range: [5, 16], title: "Price in Millions"},  
  title: "House Prices vs. Size"
};
Plotly.newPlot("myPlot", data, layout);
</script>
</body>
</html>