math9
posted by michaela .b. .
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)}

3) has two values of y for x = 1
three and negative seven 
thank you
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