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- Which of the following statements is correct?

- Which of the following equations doesn't represent a function?

- Which of the following relations is a function?

- In order to check if a graph represents a function, one uses $\cdots$?

- If the ordered pairs $\{(a,1),(2,3),(4,5),(6,7)\}$ is a function, which restriction is unnecessary?

- If the ordered pairs $\{(a,1),(2,3),(4,5),(6,7)\}$ is a function, which restriction is necessary?

- Which of the following equations represents a relation that is not a function?

- If the ordered pairs $\{(1,a),(1,2),(-2,b-a),(-2,0)\}$ define a function, find $a$ and $b$.

- Do the ordered pairs $\{(1,1),(2,1),(3,1),(4,1),(5,1)\}$ represent a function?

- Which of the following is a way of representing functions?