I cant get to know why the Markscheme had these answers.

[tired ember]

Im trying to solve this question but i dont get how to do it. ive already done A and its correct but i dont get how to do B and C.

the Mark Scheme answer was 𝑥=0,𝑦=0; 𝑥=0,𝑦=1;𝑥=1,𝑦=0 <--- answer For B .

helo would be much appreciated