Question

One number is 3 more than twice another. the sum of the numbers is 18. find the two numbers.

Answer 1

`x = 3 + 2y`

`x + y = 18`
The second equation can be modified to:

`x = 18 - y`

`3 + 2y = 18 - y`

`3y = 15`

`y = 5`
Plug y in to any of the first two equations, and you get:

`x = 13`