Which matrix equation represents the system of equations?

{-x+ 2y = 0
y= -2

We are given a system of equations,

This will translate into a 2x2 matrix of coefficients (because 2 equations and 2 unknowns),

The matrix will then be applied to the vector (lower dimensions on top),

And the result vector will be whats on the other side of equals sign,

So to put everything together,

Hope this helps :)

the square root of what number? if you add that, then someone will probably answer the question.