$\begin{array}{1 1}(a)\;x\cos 65^{\large\circ}+y\sin 35^{\large\circ}=9\\(b)\;x\cos 35^{\large\circ}+y\sin 35^{\large\circ}=9\\(c)\;x\cos 45^{\large\circ}+y\sin 45^{\large\circ}=3\\(d)\;x\cos 55^{\large\circ}+y\sin 35^{\large\circ}=9\end{array}$

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