Question

Solve the system of equations using elimination: -x-2y=19 and -x-y=12.

Answer 1

`\begin{cases}x=-5\\y=-7\end`

Explanation:

`\begin{cases}-x-2y=19\left(1)\right\\-x-y=12\left(2)\right\end`

(2)-(1)

`y=-7`

Sub into (2)

`-x+7=12\\x=-5`

Solutions:

`\begin{cases}x=-5\\y=-7\end`