Expand the following: \begin{align} ΣF_{AY}=0 =&\cssId{Step1}{F_{AY}-mg-Mg=0}\\[3px] &\cssId{Step2}{F_{TY}=+mg+Mg}\\[3px] &\cssId{Step3}{F_{TY}=g*(m+M)}\\[3px] \end{align}

- Firstly, to calculate FAY you need the weight multiplying the gravity because It's static so the resultant is the normal force.
- Secondly, we pass the mg and Mg to other side so It's positive.
- Thirdly, we put it as the gravity multiplying the sum of the weights.