Chapter 5.4, Problem 29MS

Here we celebrate the power of algebra as a powerful way of finding unknown quantities by naming them, of expressing infinitely many relationships and connections clearly and succinetly, and of uncovering pattern and structure.

Finding $y$. Each graph below corresponds to a function whose $y$ value lies between 0 and 2. Which functions have an $x$ value that gives a correspondign $y$ value of 1? Which have an $x$ value that gives a corresponding $y$ value of 0.5?l