Which relation is a function? {(8, –5), (–5, 8), (–5, –8), (–8, 5)}
{(2, –3), (–3, 2), (2, 3), (–2, 3)}
{(–7, 6), (6, –7), (–7, 9), (10, 3)}
{(5, –4), (–4, 5), (–5, 4), (4, –5)}

c

Step-by-step explanation:

the last one

Step-by-step explanation:

when looking for the function we have to know that none of the x values can repeat

in the first one the x value -5 repeats twice so that cannot be the answer

in the second one the x value 2 repeats twice so that cant be the answer

in the third one the x value -7 repeats twice so that also cannot be the answer

in the last one each x value has a different y value or every input has a different output therefore this one is the right answer

hope this helps :D

answer: a clock

step-by-step explanation: