Systems of equations with substitution: coins (Full video)

Khan Academy

Supporting grades: 8

Description: Sal solves a word problem about the number of nickels and quarters in a piggy bank by creating a system of equations and solving it. Created by Sal Khan and Monterey Institute for Technology and Education. As a birthday gift, Zoey gave her niece an electronic piggy bank that displays the total amount of money in the bank as well as the total number of coins. After depositing some number of nickels and quarters only the display read money $2.00, number of coins 16 How many nickels and quarters did Zoey put in the bank? Let's let n equal the number of nickels.

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