if f={(−2,4),(1,−1),(4,4)} and g={(0,1),(1,2)}, what is (f-g)(1)

Question

if f={(−2,4),(1,−1),(4,4)} and g={(0,1),(1,2)}, what is (f-g)(1)

Answer 1

Since (1,-1) is on the graph of y = f(x), f(1) = -1

Similarly, g(1) = 2

So, (f - g)(1) = f(1) - g(1) = -1 - 2 = -3