Question

h(x)=23 is the function linear?

Answer 1

A linear equation is one that can be put into "standard form" as:

Ax + By = C

Where A and B are not BOTH = 0, and A, B and C are all real numbers.

So what do you think? Does this function "qualify" as linear? :)

Answer 2

but y=23 is a line

Answer 3

parallel to x axis

Answer 4

Yes, that's correct. All linear functions are lines. :) This is, specifically, a constant function. But constant functions fall within the criteria for linear functions. They are a particular type of linear function.

Answer 5

If you review this, all the way down near the bottom it talks about constant functions:
http://www.mathsisfun.com/algebra/linear-equations.html