how do u solve and check 2b-5=8b+1?

Question

i need to know how to solve and check this question.

 

 

Answer 1

2b - 5 = 8b + 1
8b - 2b = -5 - 1
6b = -6
b = -1

To check:

L.H.S. = 2(-1) - 5 = -7
R.H.S. = 8(-1) + 1 = -7

L.H.S. = R.H.S.

Hence, b = -1 is correct.

Answer 2

8a+2b=-36

-8a+b=42

Answer 3

how do you solve for  4 over x^2-2y-3  and x=1

y=kxto find y for x=6 I am very syuck on these help me please