I am not able to figure out how it is calculated , how did they arrive 3 /1 . Can someone please tell me what formula the instructor are using , i went back and forth in the previous chapters no clue ! Please help me

Sorry please ignore figured out it is Av = A * v

```
3 1 1
1 2 1
3 * 1 +1 * 1 4
1 * 1 +2 * 1 3
```

Hello @Gunaranjan,

The goal is to apply the transformation matrix for each point on the left side of the plane and to obtain the transformation on the right side of the plane. So for each point, you have to place the coordinates of the point in a vector and then perform a simple multiplication between the matrix and the vector to obtain the new vector which will contain the coordinates of the point after its transformation:

3 = 3x1 + 1x0 = 3

1 = 1x1 + 2x0 = 1

Hoping to have helped you!

Stephane