Anthony's weight is nine pounds more than twice his brothers weight. anthony's weighs 59 pounds. how much does his brother weigh?

how do i solve

A = Anthony's weight
B = Anthony's brother's weight

  A = 2B + 9   Plug in Anthony's weight
59 = 2B + 9   Subtract 9 from both sides
50 = 2B   DIvide both sides by B
25 = B   Switch the sides to make it easier to read
  B = 25

Anthony's brother weighs 25 pounds. 

You have to substitute his brothers weight with a variable. Here are the steps:
1: What are you looking for?
-You are looking for how much his brother weighs.
2: Let's use the variable b to represent his brothers weight.
3: Anthony's weight is nine pounds more than twice his brothers weight. That means 2b+9. Since Anthony weighs 59 pounds, the answer is 2b+9= 59.