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Evaluate functions from their graph

Problem

Find the output, y, when the input, x, is 4.
y=
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0.75
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
A graph made up of connected line segments. From left to right the graph passes through the points (negative 10, 2), (negative 9, 1), (negative 8, 0), (negative 7, 2), (negative 6, 1), (negative 5, 2), (negative 4, 1), (negative 3, 0), (negative 2, negative 1), (negative 1, 0), (0, negative 1), (1, negative 2), (2, negative 1), (3, negative 1), (4, negative 2), (5, negative 3), (6, negative 2), (7, 0), (8, 1), (9, 0), and (10, negative 1).
Stuck?
Stuck?