# Numbers | Maths with Lemon

Source: https://mathswithlemon.io/aa-functions-linear-models.html


## Linear Functions

"Nature is written in mathematical language. " Galileo Galilei


#### Linear Modeling


##### What you have to know:

- You must be able to solve linear equation. (If not, check this lesson)
- You must be able to Rearrange Formulae. (If not, check this lesson)

##### Key Points

- 1. Watch the video:
- 2. Read this presentation 3. Watch this video about lines and y-intercept form. 4. Watch this video about perpendicular lines
- 3. Watch this video about lines and y-intercept form. 4. Watch this video about perpendicular lines
- 3. Watch this video about lines and y-intercept form. 4. Watch this video about perpendicular lines
- 4. Watch this video about perpendicular lines
- 4. Watch this video about perpendicular lines

#### Angle of a Line


##### What you have to know:

- We must also notice that the gradient is at the same time the tangent of the angle of the line with x-axis.

##### Key Points

- 1. Watch the video:

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