$($Ans: Coordinates $1\mathrm{.}165m,2\mathrm{.}32m)$

Sections $5\mathrm{.}1-5\mathrm{.}4$:

Problem $5-3$: Determine the reaction at $A,$ and the

components of the reaction at $B.$

$($Ans: $R_A=105\mathrm{.}1lb7,B_x=97\mathrm{.}4lb,B_y=269lb)$

Someone please help me in understanding how to sum the moments to find the magnitude of the reaction at A