Question

I need to know what 8(ii) because I don’t know the method

Answer 1

Notice y° and y° and 50°, are all three angles in a flat-line, namely "linear angles", and since a flat-line is always 180°.

$\bf y+y+50=180\implies 2y=180-50\implies 2y=130 \\\\\\ y=\cfrac{130}{2}\implies y=65$