Question

if a upon B equals to 8.3 find 4 + 5 upon 4 minus 5if a upon B equals to 8.3 find 4 + 5 B upon 4 minus 5 b

Answer 1

$\frac{a}{b} = 8.3 \\ \\ b = \frac{8.3}{a} \\ \\ \\ \frac{4 + 5b}{4 - 5b} = \frac{4 + 5(\frac{8.3}{a}) }{4 - 5( \frac{8.3}{a} )} \\ \\ \frac{4 + \frac{41.5}{a} }{4 - \frac{41.5}{a} } \\ \\ (\frac{4a + 41.5}{a} ) \div (\frac{4a - 41.5}{a} ) \\ \\ \frac{4a + 41.5}{4a - 41.5}$