<p>Which of the following are graphs of functions?  For those relations which are functions, write down the domain (as you observe) and the range.</p>
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<p><strong>Remark.</strong><br><br>You may treat the vertical line test as a convenient visual test.  It is not a rigorous proof that a relation is a function.</p>

Which of the following are graphs of functions?  For those relations which are functions, write down the domain (as you observe) and the range.

**Remark.**

You may treat the vertical line test as a convenient visual test.  It is not a rigorous proof that a relation is a function.

Identifying functions by vertical line test

Identifying functions by vertical line test