Question

If a+b+b =24 and b-a =4 what is a?​

Answer 1

a = 16/3, b = 28/3
This is only a substitution

Answer 2

a = 5 1/3

Explanation:

a+b+b = 24

a + 2b = 24

b-a =4

a = b - 4

b - 4 + 2b = 24

3b = 24 + 4

b =28/3

substitute this in a = b - 4

a = 28/3 - 4

a = 28/3 - 12/3

a = 16/3

a = 5 1/3