Answer
$$2x+10y+8z+5w=-1\\ -3x+4y +9w=2$$
Work Step by Step
In order to write a matrix that would solve a linear equation, we would write the coefficients of each variable in their own column. Thus, we reverse the process to find:
$$2x+10y+8z+5w=-1\\ -3x+4y +9w=2$$