2y = x + 1 --- (1)
-2x - y = 7 --- (2)
From (1), we have:
y = (1/2)x + (1/2) --- (3)
Substituting (3) into (2), we will get:
-2x - ((1/2)x + (1/2)) = 7
-2x - (1/2)x - (1/2) = 7
-(5/2)x = 7 + (1/2)
-(5/2)x = 15/2
-5x = 15
x = 15 / -5
x = -3
Substituting x = -3 into (3), we will get:
y = (1/2)(-3) + (1/2)
y = (-3/2) + (1/2)
y = (-2/2)
y = -1
Hence, x = -3 and y = -1