Respuesta :

Answer:

B and C are functions but A and D are not

Step-by-step explanation:

Vertical line testing. You draw a vertical line. If the vertical lines passes through one line, its a function. It it passes through more than one line, its not. Or in other words, each input (x-value) has its own output (y-value)

only c is a function.


a, b, and d all fail the vertical line test, meaning their x values can have multiple outputs.