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Kuri spent a total of $68 on trading cards. His collection contains two types of cards. A pack of trading card A cost $4, and a pack of trading card B cost $7. How many packs of each type of trading card were purchased if the total number of packs is 11

Answer :

Let x = the number of packs for trading card A
Let y = the number of packs for trading card B

x + y = 11
4x + 7y = 68

Try and solve for y first
x = 11 - y
Substitute
4(11 - y) + y =68
Y =8 then x= 3

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