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QuestionMathematics

Which graph represents a function?
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Answer

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Step 1:
I'll solve this problem step by step, focusing on identifying which graph represents a function.

Step 2:
: Recall the definition of a function

A function is a relation where each input (x-value) corresponds to exactly one output (y-value). Graphically, this means that a vertical line drawn anywhere on the graph should intersect the graph at most once.

Step 3:
: Apply the vertical line test

I'll mentally draw vertical lines through each graph to check how many times they intersect the curve.

Step 4:
: Analyze Graph A

- If I draw vertical lines through Graph A, some lines will intersect the curve twice. - This means Graph A is NOT a function.

Step 5:
: Analyze Graph B

- Vertical lines drawn through Graph B will intersect the curve only once. - This means Graph B IS a function.

Step 6:
: Analyze Graph C

- Vertical lines drawn through Graph C will intersect the curve multiple times. - This means Graph C is NOT a function.

Final Answer

The key concept here is the vertical line test: if any vertical line intersects a graph more than once, the graph does not represent a function.