Question 310692
Let x = the first number
Let y = the second number


use the given information to come up with 2 equations:


Equation 1: x + 2y = 9
Equation 2: x - y = 3


Rearrange Equation 2 so that it is isolated for x:

x = 3+y


Plug this value into equation 1, instead of x:


(3+y) + 2y = 9
3 + 3y = 9
3y = 6
y=2


From equation 2, we know that x = 3+y


x=3+2
x=5


The two numbers are 5 and 2.