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Katy's class visited the bookfair this afternoon. She bought a set of mm books from her favorite mystery series and a set of 44 books from her favorite science fiction series. Katy bought 99 books in all.\newlineWhich diagram models the story?\newline\newlineWhich equation models the story?\newlineChoices:\newline(A) m+4=9m + 4 = 9\newline(B) m−4=9m - 4 = 9

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Q. Katy's class visited the bookfair this afternoon. She bought a set of mm books from her favorite mystery series and a set of 44 books from her favorite science fiction series. Katy bought 99 books in all.\newlineWhich diagram models the story?\newline\newlineWhich equation models the story?\newlineChoices:\newline(A) m+4=9m + 4 = 9\newline(B) m−4=9m - 4 = 9
  1. Set up equation: Katy bought mm books from the mystery series and 44 books from the science fiction series, totaling 99 books. To find the number of mystery books, we set up the equation m+4=9m + 4 = 9, where mm represents the mystery books.
  2. Solve equation: Solve the equation m+4=9m + 4 = 9 by subtracting 44 from both sides to isolate mm. This gives m=9−4m = 9 - 4, which simplifies to m=5m = 5.

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