Answer:
(x, y) = (-4, 3)
Step-by-step explanation:
x + y = -1 $|Rightarrow$ x = -1 - y
x - y = -7
Substituting the value of x (first equation) into the second equation, we get:
(-1 - y) - y = -7.
Simplifing, we get:
-1 -2y = -7
-2y = -6
y = 3.
Now that we know the value of y, we can solve the value of x by substituting y into the first equation. We get:
x = -1 - 3
x = -4
