What is the axis of symmetry for y = 3x^2 + x - 2

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0