Answer:The last one
Explanation:
A function has to return a unique value when given an argument. In the last set
} ( – 2 , 1 ) , ( 3 , – 4 ) , ( – 2 , – 6 )}
, the argument -2 is supposed to return both 1 and -6 : this is not possible for a function.
Step-by-step explanation:

<h2>
Explanation:</h2>
In this exercise, we have the following point:

Let's assume that y varies directly as x, so this implies we can writ y as the product of x and some non-zero real constant k. In a mathematical language:

As you can see, this is the equation of a line whose slope is k and passes through the origin. Therefore, the slope of the line is the constant of proportionality we are looking for:

<h2>Learn more:</h2>
Direct and indirect proportionality: brainly.com/question/10945121
#LearnWithBrainly
Answer:
D.
Step-by-step explanation:
Just did it. hope it helps!
the answer is 39 because you need to divide.