Step-by-step explanation:
[tex]x + 9y = - 18 \\ 8x - 4y = - 18 \\ x = - 18 - 9y \\ 8( - 18 - 9y) - 4y = - 18 \\ - 144 - 72y - 4y = - 18 \\ - 76y = 126 \\ y = - 1.66 \\[/tex]
[tex]x = - 18 - 9y \\ x = - 18 - 9( - 1.66) \\ x = - 18 + 14.94 \\ x = - 3.06[/tex]
