Age problem (basic algebra)

Question

Jeremy and Mike have a combined age of 9. However Jeremy is 3 years older then twice Mike's age. How old is the brothers?

Answer 1

J= 3+ 2M

J+M = 9

3+2M + M = 9

3M = 9-3 = 6

M = 6/3 = 2 = Mike's age

J= 9-2 = 7 = Jeremy's age

7= 3+2(2) = 3+4