From Mechanics

\displaystyle {\mathbf{F}_{1}} = (\displaystyle 9\mathbf{i}+12\mathbf{j}) N

\displaystyle {\mathbf{F}_{2}} = (\displaystyle -4\mathbf{i}+\mathbf{j}) N

Their sum is the resultant force \displaystyle \mathbf{R}

\displaystyle {\mathbf{R}} =\displaystyle \mathbf{F}_{1}+\mathbf{F}_{2} =(\displaystyle 5\mathbf{i}+13\mathbf{j}) N