$\overline{\mathrm{a}}=3\overline{\mathrm{i}}+\overline{\mathrm{j}}-2\overline{\mathrm{k}},\overline{\mathrm{b}}=-\overline{\mathrm{i}}+2\overline{\mathrm{j}}-4\overline{\mathrm{k}},\overline{\mathrm{c}}=5\overline{\mathrm{i}}+4\mathrm{j}-8\overline{\mathrm{k}}\text{ and }\mathrm{x}\overline{\mathrm{a}}+\mathrm{y}\overline{\mathrm{b}}=\overline{\mathrm{c}}$ then $(\mathrm{x},\mathrm{y})=$

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