# ho to solve question no (b)

$\angle xand\angle x+30\xb0$make supplementary angles i.e. their sum is 180. so we have;

$x+x+30=180\phantom{\rule{0ex}{0ex}}\Rightarrow 2x+30=180\phantom{\rule{0ex}{0ex}}\Rightarrow 2x=180-30\phantom{\rule{0ex}{0ex}}\Rightarrow 2x=150\phantom{\rule{0ex}{0ex}}\Rightarrow x=\frac{150}{2}=75\xb0$

Regards

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