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Functions: Identify & Evaluate — Is It a Function?

Check yes or no: is the relation a function? A relation is a function only if every input (x) has exactly one output (y). Then explain.

ExampleIs this relation a function?
{ (4, 7), (5, 9), (8, 6), (7, 7) }
yesno
Why? every input has exactly one output
  1. 1.Is this relation a function?
    { (6, 3), (5, 4), (4, 3), (8, 7) }
    yesno
    Why?
  2. 2.Is this relation a function?
    { (5, 7), (8, 3), (2, 2), (3, 5) }
    yesno
    Why?
  3. 3.Is this relation a function?
    { (7, 1), (8, 6), (4, 1), (7, 4), (1, 7), (2, 4) }
    yesno
    Why?
  4. 4.Is this relation a function?
    { (2, 9), (6, 4), (3, 2), (1, 7) }
    yesno
    Why?
  5. 5.Is this relation a function?
    { (1, 5), (6, 9), (8, 3), (5, 9), (8, 8), (7, 1) }
    yesno
    Why?