Question

This is easy but i need help on it

Answer 1

Did the quiz A is correct :)

Answer 2

A is a function

To represent a function each value from the input (x ) can only map to exactly one value in the output (y)

In B

x = 3 → y = 10/ 30 ← 2 values of y

In C

x = - 5 → y = 2/ 3 ← 2 values of y

x = - 10 → y = 4/ 5 ← 2 values of y

In D

x = 20 → y = 25/ 35 ← 2 values of y

A is the only table where each value of x maps to exactly one value in y