Look at Part 1. Does
Yes; a relation shows a connection between two quantities (in this case,
Which variable is the input in this relation? Which variable is the output?
Are the relations in Part 1 and Part 2 functions? How do you know?
Yes. For both relations, each input value only has one output value.
Look at Part 3. How can you determine whether a relation is a function based on its graph?
Determine whether each input value has only one output value by using the vertical line test.
Is the relation in Part 3 a function? How do you know?
No; if you draw a vertical line at
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