Johnson Knight
10/20/2024 · Junior High School
12. Suppose you are an avid reader and are looking to save money on the cost of books. Instead of paying about \( \$ 20 \) for each book, you decide to look into purchasing a Kindle for \( \$ 120 \). You can purchase e-books for about \( \$ 5 \) each. a. Find the slope-intercept equation for the cost of the hard copy of books using \( x \) to represent the number of books. \[ y=m x+b \] \[ y=20 x+0 \quad y=20 x \] b. Find the slope-intercept equation for the cost of the Kindle with cost of e-books using \( x \) to represent the number of books.
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The cost of hard copy books is \( y = 20x \) and the cost of Kindle with e-books is \( y = 5x + 120 \).
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