William Sit's answer to gxcc1's Primary 5 Maths Whole Numbers Singapore question.

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William Sit
William Sit's answer
2 answers (A Helpful Person)
1st
This is Simultaneous Equations/Systems of Equations. I don't know if you have learned it yet in Primary 5. Also, the bottom part of "When x=9......" is just for fun, so no need to submit that for homework.