PLEASE ANSWER THIS

Which relation is a function?

the x and y rows are separated

A. x y

4 -2

5 -3

6 -2

7 -2

B. x y

3 10

2 20

3 30

4 40

C. x y

-5 2

-5 3

-10 4

-10 5

D. x y

10 15

20 25

8 30

20 35

(A)

Step-by-step explanation:

In a function, each value of X is related to ONE y value.

To identify a function, check if the x values repeat. If they do not, then the relation is a function.

Answer A's domain is [4,5,6,7]. The x values do not repeat, so A is a function.

B, C, and D all have repeating x values in the domain.

the answer would be A

Step-by-step explanation:

The formula that can be used to determine the number of cupcakes sold is x = 0.2p - 0.6y.

Step-by-step explanation:

Given:

p = 5x+3y (1)

The formula that can be used to determine the number of cupcakes sold, i.e. x, given p and y, can be obtain by solving for x in equation (1) above as follows:

5x = p - 3y

Divide through by 5, we have:

x = P/5 - (3/5)y

x = (1/5)p - (3/5)y

x = 0.2p - 0.6y

Therefore, the formula that can be used to determine the number of cupcakes sold is x = 0.2p - 0.6y.