\(\eqalign{& a)\,\,{{y - x} \over {4 - x}} = {{x - y} \over {...}} \cr & b)\,\,{{5 - x} \over {11 - {x^2}}} = {{...} \over {{x^2} - 11}} \cr} \)
\(\eqalign{& a)\,\,{{y - x} \over {4 - x}} = {{x - y} \over {x - 4}} \cr & b)\,\,{{5 - x} \over {11 - {x^2}}} = {{x - 5} \over {{x^2} - 11}} \cr} \)
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