Answer :
b = 9 + 4a and a + b = 89, so a = 89 - b , so b = 9 + (4*89) - 4b, so 5b = 365
b = 73. 89-73 is 16. a = 16
The numbers are 16 and 73
b = 73. 89-73 is 16. a = 16
The numbers are 16 and 73