hibyeimahiperson
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Chang and Cal both collect pearls. Chang has three more pearls in her collection than Cal. Write an expression to represent the total number of pearls in both collections.

Respuesta :

Let x be the number of pearls in Chang's collection.  Let y be the number of pearls in Cal's collection.

Chang has 3 more than Cal, so x = y + 3.
Adding both collections would be x + y.  It's easier to have an expression in one variable, so we will substitute what we had written about Chang in for x.
(y + 3) + y = 2y + 3.

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