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PLEASE ANSWER QUICK 20 POINTS!!!!!

PLEASE ANSWER QUICK 20 POINTS!!!!!-example-1
User Armel
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The first one top left
User Ovidiu Latcu
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The first one (top left) is a function. Use the vertical line test, if a vertical line crosses the line drawn on the graph twice, then it's not a function.
User Felastine
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