Chapter 3, Problem 27P

GO If $\stackrel{\to }{d}+{\stackrel{\to }{d}}_2=5{\stackrel{\to }{d}}_3\text{, }{\stackrel{\to }{d}}_1-{\stackrel{\to }{d}}_2=3{\stackrel{\to }{d}}_3$, and ${\stackrel{\to }{d}}_{\text{3}}=\text{2 <mover accent="true"> i <mo> ^ </mo> </mover>}+\text{4 <mover accent="true"> j <mo> ^ </mo> </mover>}$, then what are, in unit-vector notation, (a) ${\stackrel{\to }{d}}_{\text{1}}$ and (b) ${\stackrel{\to }{d}}_{\text{2}}$?