Inquiry Equation on Symbolic and Numeric View

[roadrunner]

I think you might be looking for the PIECEWISE function:

Syntax:
PIECEWISE(test1, case1, ...[, test8], case8)

Used with Home settings Entry set to Algebraic to enter a piecewise-defined function in the Function app Symbolic view (among other uses). Takes as arguments pairs, each of which consists of a condition that defines a sub-function domain and an expression that defines the sub-function. Each of these pairs defines a sub-function of the piecewise
function and the domain over which it is active.

If used with Home settings Entry set to Textbook or if accessed via the Template menu, then the syntax varies slightly and is restricted to two pieces.

Syntax :
{case1 if test1
…
{case8 [if test8]

Example:
PIECEWISE(X<-4,X,-4≤X AND X<2, X+1, X≥2,X+2) as F1(X) in the Symbolic view of the Function app appears as:

X if X<-4
F1(X)= X+1 if -4≤X AND X<2
X+2 if X≥2

In Plot view, the graph of two rays and a segment is drawn.