Could someone me with this ? we just started this today and don't understand it. "write an inequality for each graph."

Find the slope of a line given the following two points

How do i do this? i don’t understand

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values