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Choose which quantity is the subject - Paper 1

Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.

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Formula: T = 7a + 4b. Make a the subject by first subtracting the whole 4b term, then dividing by 7. For a numerical check use b = 2 and T = 22. Also compare the general formula T = ka + mb, where dividing by k needs k not equal to zero.

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