Question

HELP ME PLEASE!

Answer 1

Which relation is a function?
{(1, 2), (1, 5), (1, -1), (1, 4)}

{(8, -1), (2, -1), (3, 8), (2, 5}

{(-3, 4), (-2, 5), (0, 9), (0, 12)}

{(7, 12), (1, -5), (3, -10), (2, -5)}

Answer 2

If you come back,first you throw all of these coordinates into a table then see if each x value in each table is paired with exactly 1 y value. If they are then it is a function. If it isn't, then it isn't a function