Thank you for the opportunity to help you with your question!

since the pairs are supplementary so:

(4y + 5x+1) = 180

(17y-9) + (21x-3) = 180 ??

is this the pair.

please make the question clear.

Please let me know if you need any clarification for the doubts. I'm always happy to answer your questions. Looking forward to help you again. thank you. :)