Question

Rewrite y + 3 = 0 using function notation.

A) f(x) = 3
B) f(x) = -3
C) f(x) + 3 = 0
D) f(x) = y + 3

Answer 1

First rewrite as y = ..., just move the +3 to the other side (sign flips):

y = -3.

Then replace y by f(x):

f(x) = -3.

This is a straight line at y=-3.

Answer B.