i need a clear explanation pls , i dont understand this topic thank you in advan

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secondary 2 | Maths
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secondary 2 Maths Singapore

i need a clear explanation pls , i dont understand this topic thank you in advanve :))

Date Posted: 4 years ago

done {{ upvoteCount }} Upvotes

clear {{ downvoteCount * -1 }} Downvotes

Hi just very simple. Just substitute the equations into one of the other equation.

Date Posted: 4 years ago