Question

Does anyone know the answer to number 3?

Answer 1

`(-3, 5)`

Explanation:

Isolate x from the first equation:

`x=(11-4y)/(3)`

Now, substitute it in the second equation:

`\begin{bmatrix}2\cdot (11-4y)/(3)+y=-1\end{bmatrix}`

This gives you:

`\begin{bmatrix}(22-5y)/(3)=-1\end{bmatrix}`

So, you conclude: y = 5

Next, we substitute y = 5 into
`x=(11-4y)/(3)`

So, we get:

`x=(11-4\cdot \:5)/(3)`

Then:

`x=-3`

Finally, we have to put it into the coordinate form:

`(-3, 5)`