Question

Is this mapping a diagram function, why or why not?

Answer 1

not a function

Explanation:

for the mapping to be a function, each value of x (input ) must map to exactly one unique value of y ( output )

here 1 → 2 and 1 → - 2

- 5 → 4 and 5 → - 4

since the input for these values maps to 2 output values

Then the mapping is not a function