Question: Which relation is not a function? a) y = x b) y = x2 - 9x + 1 c) {(-1,0) , (1,5) , (-1, 6),

Which relation is not a function?

a) y = x

b) y = x2 - 9x + 1

c) {(-1,0) , (1,5) , (-1, 6), (2,10)}

d) 2x + y = 1

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