The video below might be helpful:
https://www.khanacademy.org/math/algebra-basics/core-algebra-systems/core-algebra-systems-word-problems/v/using-a-system-of-equations-to-find-the-price-of-apples-and-oranges
Homework:
Exercise 2.5 (page 64) # 1 – 5
Challenge Yourself! # 6 – 10
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