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Sagot :
9514 1404 393
Answer:
a) not a function
b) is a function
c) not a function
d) is a function
Step-by-step explanation:
If the graph passes the "vertical line test," then the relation is a function.
Choices B and D are linear equations. Their graph is a straight line, so each x-value corresponds to exactly one y-value. (Every non-vertical line passes the vertical line test.)
Choices A and C are equations of parabolas that open horizontally. It is easy to draw a vertical line that intersects the graph twice, so these relations fail the vertical line test.
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B, D -- functions
A, C -- not functions
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