Kuang Yu Heng's answer to Elaine's Junior College 1 H2 Maths Singapore question.

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Kuang Yu Heng
Kuang Yu Heng's answer
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To solve these kinds of questions, we first express one variable in terms of the other variable and a constant (if there is in this case)

We can substitute it back into the original equation and simplify it to show the expression given is correct.