Question

For each representation below, decide if it is a function. Justify your answer.

Answer 1

a) No, since x = 7 maps onto both y = 8 and y = 9, which violates the rule that inputs of a function must have only one output.

b) Yes, because each value of x maps onto only one value of y.

c) No, because some values of x map onto more than one value of y, which violates the rule that inputs of a function must have only one output.