12.1k views
3 votes
How old was Lisa x years ago if she is now 13? Which expression represents this?

User Helm
by
4.8k points

2 Answers

2 votes

Answer:

a = 13 - x

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...)
User Yen NQ
by
5.4k points
2 votes

Answer:13-x= y

Explanation:

User Jefferey
by
5.5k points
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