Question

What is the common point of `x+2y=6` and `x+y=2`?

Answer 1

The answer is: `(-2,4)`.

We can substact the second equation from the first:

`x+2y=6`
`x+y=2`

`rArrx-x+2y-y=6-2rArry=4` and from the second equation in which `y=4`

`rArrx+4=2rArrx=-2`.