1.) Which relation is a function?
A {(–3, 4), (–2, 5), (0, 9), (0, 12)}
B. {(8, –1), (2, –1), (3, 8), (2, 5}
C. {(7, 12), (1, –5), (3, –10), (2, –5)}
D. {(1, 2), (1, 5), (1, –1), (1, 4)}

2.)which relation is a function?

1) A function won't have repeats of the x values . Thus the first choice will not be a function because of the 2 '0' x values.
C is the answer to thid question

2) The first choice A is the only function. It is the only one which passes the vertical line test. ( if we can draw any vertical line which passes through more than one point on the graph then its is NOT a function).

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1.) Which relation is a function? A {(–3, 4), (–2, 5), (0, 9), (0, 12)} B. {(8, –1), (2, –1), (3, 8), (2, 5} C. {(7, 12), (1, –5), (3, –10), (2, –5)} D. {(1, 2), (1, 5), (1, –1), (1, 4)} 2.)which relation is a function?

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1.) Which relation is a function?
A {(–3, 4), (–2, 5), (0, 9), (0, 12)}
B. {(8, –1), (2, –1), (3, 8), (2, 5}
C. {(7, 12), (1, –5), (3, –10), (2, –5)}
D. {(1, 2), (1, 5), (1, –1), (1, 4)}

2.)which relation is a function?