"Dose" is a measured portion of a medicine.
There is no word such as "lilne".
So the phrase does not have any meaning in mathematics - nor in the English language! Perhaps you should review what you want to ask, check the spellings of the key words and then resubmit the question.
it means that you are plotting the points on a graph, or XY coordinate plane
the point (0,0) on a graph
A flip over the x-axis on a graph.
It wants you to take the data that is given in the table and graph it. Depending on what sort of data it is, it might be asking you to graph it on the Cartesian Plane (x vs y).
a graph key is when one end of the graph goes into a nother graph and makes baby graphs.