Is y equals 23 linear

Answer 1

Yes.

If you were to plot y=23 on a graph, you'd have a straight horizontal line where y=23 (because no matter what the value of x is on the graph, y is always 23).

As the line that is plotted is straight, the equation is considered linear.

Answer 2

The quality of the browser through which questions are posted is pathetic: it does not accept most mathematical symbols. It is not possible to be certain what the question is but I suspect that the answer is yes, it is linear.

Answer 3

y=23 is linear. The line is a horizontal line at y=23, where x is infinite.