4. Which correctly explains whether or not the graph shown at the right is a function?
Y.
A. Yes, the graph passes the horizontal line test.
B. Yes the graph passes the vertical line test.
C. No; the graph does not have a constant rate of change,
D. No; each input on the graph has more than one output

The answer is D

Step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

the height of the surface increases from the center out to the sides of the road

it is c!