What is the answer for -4x 4y-8 and x-4y-7 using matrices?

Answer 1

Oh, dude, using matrices for these two equations, you'd set up a system like this: [-4 4 -8] [x] = [0] and [1 -4 -7] [y] = [0]. Solve it however you want, like with Gaussian elimination or something, and you'll find the values of x and y that make both equations true. So, like, have fun crunching those numbers, I guess.

Answer 2

The question contains expressions, not equations. It is not possible to solve linear expressions - whether you use matrices or not.