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12-02-2017
Mathematics

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A corner store sells two kinds of baked goods. Cakes and pies. Cakes costs $5 and pie cost $7. They sold 15 baked goods for 91$. How many cakes didthey sell?

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konacat9 konacat9

12-02-2017

Cake=x
Pie=y

x+y=15
5x+7y=91

(x+y=15)-7
5x+7y=91

-7x+(-7y)=-105
5x+7y=91

-2x=-14
x=7

They sold 7 cakes

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