J's answer to Yang li shuang's Secondary 4 A Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
J
J's answer
1024 answers (A Helpful Person)
1st
Explanation in main comments section of question. Use desmos.com to plot and verify the shape of your drawing (that is, if you try to plot it on your own sfter following the explanation)