1.   Choose the graph that is not a function.
    A. B.
    C. D.
    Hint
  2.   Choose the relation that is a function.
    A. B.
    C. D.
    Hint
  3.   Determine which equation represents a function.
    A. x = y2 - 1 B. x = 4
    C. y = -2x + 1 D.
    Hint
  4.   Which graph represents a function?
    A. B.
    C. D.
    Hint
  5.   Find if f(x) = -12x +
    A. -8 B. 1
    C. -9 D. 0
    Hint