Quick questions on Changing the subject of a formula for HSC Maths Standard 2

1short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is transposing is solving an equation you do not finish numerically?

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Changing the subject uses the same steps as solving a linear equation. So if you can solve

18n + 250 = 1330

for

n

, you can make

n

the subject of

C = 18n + 250

. The only difference is that the right side stays as the letter

C

instead of a number, so you finish with a formula rather than a value. Picture how the chosen variable was built up, then undo each operation in reverse, doing the same thing to both sides each time.

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