Posted by **michaela .b.** on Sunday, May 22, 2011 at 6:24pm.

which relation is NOT a function?

1) {(1,5),(2,6),(3,6),(4,7)}

2) {(4,7),(2,1),(-3,6),(3,4)}

3) {(-1,6),(1,3),(2,5),(1,-7)}

4) {(-1,2),(0,5),(5,0),(2,-1)}

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