---
id: 5d8a4cfbe6b6180ed9a1c9f2
title: Part 21
challengeType: 0
dashedName: part-21
---
# --description--
Your line graph needs some scales so it knows how to translate the data into visual distances. The first one is the scale for the y-axis. It will be to show the number of followers. D3 has many utilities for creating scales. You want to use it's `scaleLinear` method for this scale.
Create a new `const` named `yScale`, and set it equal to `d3.scaleLinear()`.
# --hints--
test-text
```js
assert(
typeof yScale === 'function' && /yScale\s*=\s*d3\.scaleLinear/.test(code)
);
```
# --seed--
## --before-user-code--
```html
D3 Dashboard
```
## --seed-contents--
```html
```
# --solutions--
```html
```