Question

Is the following a function?
{(1, -2), (-2, 0), (-1, 2), (1,3)}

Answer 1

it is not a function. A function is a relation in which no two ordered pairs have the same input (or x-values) and different outputs (y-values).

You need to determine whether every first element (or input) correspond with EXACTLY ONE second element (or output).

in this case, the input value of 1 goes with two output values, -2 and 3.

It only takes one input value to associate with more than one output value to be invalid as a function.

Therefore, the given relation is not a function.