Question

The sum of two numbers is 45. 4 times the first number is 9 less than 5 times the second. What are those numbers ??

Answer 1

x +y =45----1
4x+9=5y-----2
from 2 we get 
y=4x+9/5
so  x+4x +9/5=45
5x + 4x +9=225
9x=216
x=24

so x=24
y=21----from1