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29 July, 10:12

How old was Lisa x years ago if she is now 13? Which expression represents this?

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Answers (2)
  1. 29 July, 10:16
    0
    Answer:13-x = y
  2. 29 July, 10:26
    0
    a = 13 - x

    Step-by-step explanation:

    Age = a

    (Any other letter of substitution for age would be fine)

    For example if x was 5:

    a = 13 - 5

    a = 8

    For further study:

    Research algebra on either website. (eg: Maths Is Fun, Khan Academy ...)
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