bcf inadvertently raises a very likely possibility: the teacher might just mean "a wire" but is saying "an HDMI cable."
Teachers know a lot about what they are doing, but it is very possible that this teacher means graph and does not realize that a line plot is a specific kind of graph. That might be why we all had to use google just now, despite thinking to ourselves "is that a graph?"
Textbooks can be even dumber than that.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
