MCQ
$\frac{-5}{13}+?=-1$
- A$\frac{8}{13}$
- ✓$\frac{-8}{13}$
- C$\frac{-18}{13}$
- D$\frac{18}{13}$
$\frac{-5}{13}+?=-1$
$\Rightarrow?=-1-\Big(\frac{-5}{13}\Big)$
$\Rightarrow?=-1+\frac{5}{13}$ $\Big[-\Big(\frac{-5}{13}=\frac{5}{13}\Big)\Big]$
$\Rightarrow?=\frac{-1\times13+5}{13}$
$\Rightarrow\frac{-13+5}{13}$
$\Rightarrow=\frac{-8}{13}$
Hence, the correct answer is option $(b).$
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