Answer:
d. y-3 = f(x)
Step-by-step explanation:
we don't know what f(x) is. but we can see that the red line is 3 units above the black line. so we are adding 3 to whatever f(x) is. so the red line should have the equation
y = f(x) +3
subtract 3 from both sides
y-3 = f(x)