What would you like to understand?

First, find the residual by subtracting the projection $(8,4)$ from $y=(7,6)$, resulting in $(-1,2)$. Then, compute the dot product of the projection $(8,4)$ and the residual $(-1,2)$.

Conditions: $y = (7,6)$; Projection is $(8,4)$; Residual is $(-1,2)$

First, find the residual by subtracting the projection $(8,4)$ from $y=(7,6)$, resulting in $(-1,2)$. Then, compute the dot product of the projection $(8,4)$ and the residual $(-1,2)$.

Conditions: $y = (7,6)$; Projection is $(8,4)$; Residual is $(-1,2)$