# How do you combine the system of equations -8x + 8y = 0 and - 9x + 4y = 5?

$x = y = - 1$
From first equation, $8 x = 8 y$ or $y = x$
Hence, $- 9 x + 4 x = 5$ or $- 5 x = 5$
Thus, $x = y = \frac{5}{- 5} = - 1$