The point (3, 4) is on the graph of y = f(x).

Step 1. (a). $x + 1 = 3$ gives $x = 2$; the height is $2 \times 4 - 3 = 5$: $(2, 5)$.

Step 2. (b). $3x = 3$ gives $x = 1$; the height is $-4$: $(1, -4)$.

Step 3. (c). $\tfrac{x}{3} = 3$ gives $x = 9$; the height stays $4$: $(9, 4)$.