Answer:
(x, y) such that y = x - 5.
Step-by-step explanation:
To solve the system by subtitution, we first need to solve the first equation for y, so:
-x + y = - 5
-x + y + x = -5 + x
y = x - 5
Then, we need to substitute y = x - 5 on the second equation, so:
-4x + 4y = -20
-4x + 4(x - 5) = -20
Finally, we need to solve for x:
-4x + 4x - 4(5) = -20
-20 = -20
Since we got equality of -20 = -20, we can say that the system has an infinite number of solutions where y = x - 5.
Answer:
(x, y) such that y = x - 5.