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Changing The Subject

Changing The Subject. Of A Formula!. What is to be learned?. How to rearrange a formula. AB + g = M want to change to A = get rid of B and g. 4 basic rules. Rule 1. A + B = H Subtract B from each side. - B. - B. A. = H - B. Rule 2. A - B = H Add B to each side

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Changing The Subject

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  1. Changing The Subject Of A Formula!

  2. What is to be learned? • How to rearrange a formula

  3. AB + g = M want to change to A = get rid of B and g

  4. 4 basic rules

  5. Rule 1 A + B = H Subtract B from each side - B - B A = H - B

  6. Rule 2 A - B = H Add B to each side A = H + B

  7. Rule 3 AB = H Divide each side by B A = H/B

  8. Rule 4 A / B = H Multiply each side by B A = H X B

  9. Summarising A + B = H → A = H – B A – B = H → A = H + B AB = H → A = H/B A/B= H → A = HB

  10. The Magic Bridge

  11. Equations work like the magic bridge A = M (change subject to A ) B – G + G

  12. Change subject to A A – R T = B A – R ( ) T + R = B

  13. Changing the Subject of A Formula • Move unwanted letters (or numbers) to the other side. • Follow the magic bridge rules

  14. R = PT + M PT + M R = – M R PT = R – M P = T

  15. Change subject to B B G = – 6T MR B G = – 6T MR B G + 6T = MR ( ) = G + 6T B MR

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