x/4 - y/4 = -1 --- (1)
x + 4y = -9 --- (2)
From (2), we will get:
x = -4y - 9 --- (3)
Substituting (3) into (1), we will get:
(-4y - 9)/4 - (y/4) = -1
(-4y - 9) - y = -4
-5y = 9 - 4
-5y = 5
y = 5 / -5
y = -1
Substituting y = -1 into (3), we will get:
x = -4(-1) - 9
x = 4 - 9
x = -5