For quick reference to specific exercise sets, community-uploaded documents often provide scanned or transcribed answer keys: Workbook Answers : A comprehensive set of 2A Workbook Answers
If you used a different approach (e.g., substitution vs. elimination), the key doesn't verify whether your method is valid — only shows their standard method. oxford mathematics for the new century 2a answer
While a simple "answer sheet" is useful for checking, true learning comes from step-by-step explanations. If you are struggling with the Oxford New Century 2A content, here are the best resources: substitution vs. elimination)
If you are looking for the or Senior Secondary version? oxford mathematics for the new century 2a answer