Question

For each graph below, state wether it represents a function.

Answer 1

Answers:

Row 1: No, No, No

Row 2: Yes, Yes, Yes

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Explanation:

Use the vertical line test. If it is at all possible to draw a single vertical line through more than one point on the relation curve, then the relation is not a function. This is because a function is only possible when any x input leads to exactly one y output.

So that's why graphs 1,2,3 are not functions, while graphs 4,5,6 are functions.