Which of the following relations is not a function?

(8, 4), (-5, 2), (4, 1), (-6, 2)

(-5, 4), (4, 2), (8, 1), (-6, 5)

(-6, 4), (4, 3), (-5, 1), (8, 2)

(4, 4), (-5, 2), (4, 1), (-6, 2)

my answer is b

nope. d

a relation is not a function if for some x=h, there is more than one pair with that x-value.

according to d,
f(4) = 4
f(4) = 1

both cannot be true for a function.

All the other relations have distinct x values for all the pairs. They are functions.

To determine whether a relation is a function, we need to check if each input value (x-coordinate) is associated with only one output value (y-coordinate).

For option b, let's check if each input value has only one associated output value:
- (-5, 4) has an input value of -5, which is associated with an output value of 4.
- (4, 2) has an input value of 4, which is associated with an output value of 2.
- (8, 1) has an input value of 8, which is associated with an output value of 1.
- (-6, 5) has an input value of -6, which is associated with an output value of 5.

Based on this analysis, each input value in option b is associated with only one output value. Therefore, every relation in option b is actually a function. Thus, your answer is incorrect.

The correct answer is option c. In this relation, the input value 4 is associated with two different output values: 3 and 1. Therefore, option c is the relation that is not a function.