Question

If the following system of equations was written as a matrix equation in the form AX = C, and matrix A was expressed in the form [a c b d] , find the value of a - b + c + d.
5x + 7y = 7
3x - 2y = 9

My main problem is understanding which numbers are a, b, c, and d.

Answer 1

That's what I came up with. Still not sure of my answer.