Question

Solve for y yyyyyyyyyyyyyyyyyy

Answer 1

`y=-7` is the answer.

Explanation:

`\begin{bmatrix}x+y=-4\\ x-y=10\end{bmatrix}`

Multiply the second equation with -1 and add them.

`\begin{bmatrix}x+y=-4\\ -x+y=-10\end{bmatrix}\\\\\\\rightarrow 2y=-14\\\\\rightarrow y=-7`