The coordinates (4, 0) and (3, -1) represents the solution of the function f(x).
According to the question -
y = f(x) = x - 4
Case 1 : P(4, 0)
0 = 4 - 4 = 0
P (4, 0) represents a solution
Case 2: P (3, -1)
-1 = 3 - 4 = -1
P (3, -1) represents a solution