application or intradermal injection of a substance to the skin to test the body's reaction to it. Such a test detects an animal's sensitivity to such allergens as dust and pollen, or to preparations of microorganisms believed to be the cause of a disorder.
A direct relationship graph is a graph where one variable either increases or decreases along with the other. The general equation for a direct relationship graph is y = mx + b, where y denotes the...
Functional Relationships. You probably know a function is something you write out with numbers, show in a table, or plot on a graph. But you can also describe a functional relationship, or the relationship between the inputs and outputs of a given function, with words.