Mohamad Wildanus Solihin's answer to Hello's Secondary 4 A Maths question.

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Mohamad Wildanus Solihin
Mohamad Wildanus Solihin's answer
8 answers (A Helpful Person)
1st
Hopefully it is clear and helpful. First rule, always when there is gradient, usually you need to take a differentiation.

So, from the differentiation you will get the first equation, and then from the substitution itself you will get the second equation.

Then, use simultaneous equation. Ok?