Jiayang's answer to Allysha Halim's Secondary 2 Maths question.
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Here is the manual method. It's basically simultaneous eqn with 4 unknowns so the working can get a bit messy. I did substitution, you can try doing elimination maybe it'll be less messy. Alternative if you've learned how to do matrix and inverse matrix of size 4x4
Date Posted:
6 years ago