Find all real valued $n\times n$ matrices $A$ such that for any $v\in\mathbb{R}^n$ there exists $y\in\mathbb{R}^n$ with $Av=v+y$

Question

I've started with the case $n=2$ to help myself gain a general idea, but I don't really understand where to continue. Consider $A=\begin{bmatrix} a_1 & a_2 \\ a_3 & a_4 \end{bmatrix}$, $v^T=(v_1,v_2)$ and $y^T=(y_1,y_2)$. Then if $Av=v+y$, solving for the components of $y$ we have $y_1=a_1v_1+a_4v_2-v_2$ and $y_2=a_3v_1+a_4v_2-v_2$. So, is this not true for any $2\times 2$ matrix $A$, if I define $y$ in this way then I am done?

Thanks in advance.

Answer 1

Isn't there something missing from the question? Some condition, maybe? Every real valued matrix is good: let $y= Av-v$.