freeCodeCamp/guide/english/certifications/data-visualization/data-visualization-with-d3/create-a-linear-scale-with-d3/index.md

---
title: Create a Linear Scale with D3
---
## Create a Linear Scale with D3

In this D3 challenge you are required to change the scale variable to create a linear scale. Then set the output variable to the scale called with an input argument of 50.

### Hint 1

The syntax for creating a scale is:
```javascript
const scale = d3.scaleLinear();
```

### Hint 2

The `const` scale is a method, which accepts a value.

### Hint 3

The scaling factor should be set to `50`.

### Hint 4

The scaling factor is set like this:
```javascript
const output = scale(scalingFactor);
```
Where `scalingFactor` is a number.

### Solution

To solve this challenge, the `scale` variable has to be re-initialized with a D3 scale ans the scaling factor in the output has to be set to `50`, to do this, change you code to look like this:
```javascript
<body>
  <script>
    const scale = d3.scaleLinear();
    const output = scale(50);
    d3.select("body")
      .append("h2")
      .text(output);
  </script>
</body>
```
fix: change directory structure 2018-10-12 19:37:13 +00:00			`---`
			`title: Create a Linear Scale with D3`
			`---`
			`## Create a Linear Scale with D3`

Added solution to D3 scaling challenge (#34230) * Update index.md * Update index.md 2018-11-06 22:30:21 +00:00			`In this D3 challenge you are required to change the scale variable to create a linear scale. Then set the output variable to the scale called with an input argument of 50.`
fix: change directory structure 2018-10-12 19:37:13 +00:00
Added solution to D3 scaling challenge (#34230) * Update index.md * Update index.md 2018-11-06 22:30:21 +00:00			`### Hint 1`
fix: change directory structure 2018-10-12 19:37:13 +00:00
Added solution to D3 scaling challenge (#34230) * Update index.md * Update index.md 2018-11-06 22:30:21 +00:00			`The syntax for creating a scale is:`
			```javascript
			`const scale = d3.scaleLinear();`
			```

			`### Hint 2`

			The `const` scale is a method, which accepts a value.

			`### Hint 3`

			The scaling factor should be set to `50`.

			`### Hint 4`

			`The scaling factor is set like this:`
			```javascript
			`const output = scale(scalingFactor);`
			```
			Where `scalingFactor` is a number.

			`### Solution`

			To solve this challenge, the `scale` variable has to be re-initialized with a D3 scale ans the scaling factor in the output has to be set to `50`, to do this, change you code to look like this:
			```javascript
			`<body>`
			`<script>`
			`const scale = d3.scaleLinear();`
			`const output = scale(50);`
			`d3.select("body")`
			`.append("h2")`
			`.text(output);`
			`</script>`
			`</body>`
			```