Karen buys 5 cups of coffee and 2 bagels for 26$. Kenneth buys 3 cups of coffee and 3 bagels for 21$ . How much does one cup of coffee cost? How much does one bagel cost?

Answer 1

5c + 2b = 26 (multiply by 3)

3c + 3b = 21 (multiply by 2)

15c + 6b = 78
6c + 6b = 42 (subtract)

9c = 36

After finding c, insert into one of the original equation to find b.