Question 1197773
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Answers:<ol><li>Yes it's a function</li><li>Yes it's a function</li><li>No, it's not a function</li></ol>
Explanation:<ol><li>We have a function since none of the x coordinates repeat themselves. Each x input leads to <font size=4><u>exactly one</u></font> output.</li><li>Similar reasoning as problem 1.</li><li>The input x = 133 repeats itself. The input x = 133 leads to more than one output (y = -83 and y = -138). This is why we don't have a function. You can toss out or ignore the duplicate copy of (-9, -141)</li></ol>As a visual alternative, you can use the vertical line test to see if you have a function or not.
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