Which letters shown below on the number line also have their opposites labeled

B and D

Step-by-step explanation:

Letter B is 2 units below zero. Letter D is 2 units above zero.

Letter B and letter D are the same distance from distance from zero.

Therefore, opposite of letter B is letter D.

Thus, the letters that have their opposite labelled on the number line are B and D.

1.4

2.3

step-by-step explanation:

the formula for the constant of variation is

y= kx

divide each side by x

y/x =kx/x

y/x =k

we know a and y

1.   y/x = k

4/1 =4

check the other values to make sure they are the same

8/2 = 4   12/3 =4   and 16/4 =4  

the constant of variation is 4

2.   y/x = k

3/1 =3

check the other values to make sure they are the same

6/2 = 3   9/3 =3   and 12/4 =3  

the constant of variation is 3