Less than is indicated by < and is the upper case comma on keyboard
Greater than is indicated by > and is the upper case period on keyboard
If you want less than or equal to or greater than or equal to these are available as symbols on Microsoft
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"<", ">" or "≠"
The graph of an inequality is a region, not a line.
Depending on the comparison operator used, that's either an equation, or an inequality.
It is a set of three expressions , two variable and one constant. There are no operations defined for them, not any symbols of equality or inequality.
Instead of using y = mx + b you use y (inequality sign) mx + b. By inequality sign, I mean symbols like