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9. (a) Rearrange this formula to make x the subject - OCR - GCSE Maths - Question 9 - 2018 - Paper 2

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9. (a) Rearrange this formula to make x the subject. y = x - 2 (b) Rearrange this formula to make d the subject. C = πd.

Worked Solution & Example Answer:9. (a) Rearrange this formula to make x the subject - OCR - GCSE Maths - Question 9 - 2018 - Paper 2

Step 1

Rearrange this formula to make x the subject.

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Answer

To make xx the subject of the equation y=x−2y = x - 2, we follow these steps:

  1. Start with the original formula: y=x−2y = x - 2

  2. Add 2 to both sides to isolate xx: y+2=xy + 2 = x

  3. Therefore, the rearranged formula is: x=y+2x = y + 2

Step 2

Rearrange this formula to make d the subject.

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Answer

To make dd the subject of the equation C=πdC = πd, we can rearrange as follows:

  1. Start with the original formula: C=πdC = πd

  2. Divide both sides by ππ to isolate dd: d=Cπd = \frac{C}{π}

So, the rearranged formula is: d=Cπd = \frac{C}{π}

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