Practice Quiz

SAT Math

Category - Algebra and Functions

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Which of the following is the equation of the function in the graph below?
  1. y = |x|
  2. y = | − x|
  3. y = x
  4. y = − | − x|
  5. y = − x
Explanation
Answer: D - The equation of the function in the graph above is y = − | − x|. For x = 1, the first three equations give y = 1, but the function doesn’t contain point (1,1). For x = − 1, the last equation gives y = 1, but the function doesn’t contain point ( − 1,1). The only possibility left is y = − | − x|.
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