What is the equation of the blue line?
Please can someone give me a good step to step guide on how to get this one.
Thank you!
![What is the equation of the blue line Please can someone give me a good step to step guide on how to get this one Thank you class=](https://us-static.z-dn.net/files/dfc/c04f4a170b7bec639b981982e49cda07.png)