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Video: Writing Algebraic Expressions Involving Age Problems

Bethani Gasparine

Linda is @m years old, and her sibling is 9 years younger. Write an expression in the simplest form that represents the sum of their ages.

00:46

Video Transcript

Linda is ๐‘š years old, and her sibling is nine years younger. Write an expression in the simplest form that represents the sum of their ages.

So we need Lindaโ€™s age plus her siblingโ€™s age. Lindaโ€™s age can be represented by ๐‘š. And the siblingโ€™s age, whoโ€™s nine years younger, can be represented by ๐‘š minus nine.

In order to simplify, we need to combine like terms. We should combine the ๐‘šs. ๐‘š plus ๐‘š is equal to two ๐‘š. And we bring down the minus nine.

Therefore, two ๐‘š minus nine is the expression, in the simplest form, that represents the sum of their ages.