Question

Solve the system of equations for x or y, whichever you do not eliminate
5x + 4y=10
5x -4y=10
a.x=4
b.x=5
c.x=10
d.x=2

Answer 1

So, rearrange one of them so that it equals x or y. (So that it becoems either x=#-#y or y=#/#x)
Then, sub it into the other equation as x or y (The same variable as the first equation)

Answer 2

add these equations together
5x + 4y=10
5x -4y=10
10x + 0=20
solve for x

Answer 3

Thanks=)

Answer 4

\[\left[\begin{matrix}5 & 4 \\ 5 & -4\end{matrix}\right]\left(\begin{matrix}x \\y\end{matrix}\right)=\left(\begin{matrix}10 \\ 10\end{matrix}\right)\]