(6,-4) and (4,0)
What does y equal?

m = -2

Step-by-step explanation:

formula:

m = (y2 - y1) / (x2 - x1) => plug in numbers

(6,-4) and (4,0)

m = (0-(-4)) / (4-6) => solve

m = 4 / -2

m = -2

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

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice