Answer:
10. YES
9. YES
8. NO
7. YES
6. YES
5. NO
4. NO
3. NO
2. YES
1. YES
Step-by-step explanation:
10. This is what is known as direct variation, which is an automatic "yes" because when using the <em>Vertical</em><em> </em><em>Line</em><em> </em><em>Test</em><em>,</em><em> </em>they all touch <em>x</em><em> </em>at exactly ONE POINT.
9. Since they have two unique x-coordinates, this is an automatic "yes".
8. Obviously, if there are relations with a multitude of exact replicas of <em>x</em><em>,</em><em> </em>this is an automatic "no".
7. See explanation #9
6. This is a linear graph, therefore it is a function.
5. This is DEFINITELY NOT a function because although this is linear at <em>2</em><em> </em><em>=</em><em> </em><em>x</em><em>,</em><em> </em>it acts as a <em>Vertical</em><em> </em><em>Line</em><em> </em><em>Test</em><em>,</em><em> </em>and it touches EVERY <em>x</em><em>,</em><em> </em>so<em> </em>this is not a function.
4. We can tell that this is not a function because again, each time under every line, it touches another <em>x</em><em>.</em>
3. When mapping, make sure two arrows do not come from an x-coordinate, which in this case does. Anytime this happens, automatically, this is not a function.
2. Using the <em>Vertical</em><em> </em><em>Line</em><em> </em><em>Test</em><em>,</em><em> </em>they all touch at exactly ONE POINT.
1. See explanation #2
I hope this helps you out alot, and as always, I am joyous to assist anyone at any time.