What is the domain of the function shown in the mapping?

a.) {x | x = –5, –3, 1, 2, 6}
b.) {y | y = –9, –6, 0, 2, 4}
c.) {x | x = –9, –6, –5, –3, 0, 1, 2, 4, 6}
d.) {y | y = –9, –6, –5, –3, 0, 1, 2, 4, 6}

since we know that the two functions are equal, f (x) = g

(x), therefore when we equate the two equations the result should be similar to

3x = x – 4:

a. f(x) = 3x, g(x) = x – 4

equating the two functions:

3x = x – 4             (correct)

so we now got our answer (a)