The question is asking which of the pairs of numbers (x,y) make y = x - 4 true.
Just plug in each pair and see if it works.
(-1,-5)
y = x - 4
-5 = -1 - 4
-5 = -5
True.
.
(0,-3)
y = x - 4
-3 = 0 - 4
-3 = -4
Not true.
.
(2,6)
y = x - 4
6 = 2 - 4
6 = -2
Not true.
.
(3,1)
y = x - 4
1 = 3 - 4
1 = -1
Not true.
.
Answer: (-1,-5) is a solution of y = x - 4