Which choice represents a pair of parallel lines? A. 8x-2y=20 & y= -1/4x+3
B. y=3x+5 & y= 1/3x-2
C. -3x+4y=18 & y= 3/4x+6
D. -3x+4y=16 & y= -3/4x-10

1. is 4 and 2. is 3

step-by-step explanation:

so if you look at the first one you see that 1 is to 4 and 2 is to 8 and so on, so you can see for every 1 there is a times 4 so if it were 3 then it would be 3*4 and it is 12

for number 2 it is 3 because 1 is to 3 and 2 is to 6 so for every 1 there is 3 so if it were 3 then there would be 3*3 = 9

the answer would be a 24

step-by-step explanation:

c=2πr=2·π·3=24