Systems of equations with elimination: King's cupcakes (Full video)

Khan Academy

Supporting grades: 8

Description: Sal demonstrates solving a word problem by writing a system of equations and solving using the elimination method. And he says, well I know adults eat a different number of cupcakes than children eat. And I know that in my kingdom, an adult will always eat the same amount and a child will always eat the same amount. And he says, well I know at the last party we had 500 adults and we had 200 children, and combined they ate 2,900 cupcakes.

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