Let the first number be x. Let the second number be y. We're given two equations:

- x + 2y = 6
- 2x + y = 15

- -2x - 4y = -12
- 2x + y = 15

-2x + 2x - 4y + y = -12 + 15

-3y = 3

Divide each side by -3:

y = 3/-3

y =

**-1**

Plug this back into equation 1:

x + 2(-1) = 6

x - 2 = 6

To solve for x, we type this equation into our search engine and we get:

x =

**8**