Question

Is it a function? X (-2, -1, 0, 1, 2 ) Y (-7, -2, 1, -2, -7 )

Answer 1

To be a function, it is nesessary that the values of x correspond to a unique value of y (a value of x cannot correspond to 2 different values of y). The same value of y can correspond to two or more values of x

As in the given data each value of x has just one value of y. Then, it is a function.