Which expression is equivalent to 1/3b - 7?

-1/3(b+21) 1/3 (b-21) -1/3 (b-21) 1/3(b+21)

a

explanation:

i think that you should ask google for the answer to that problem because if we don't know it google does

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right