The two types of variables are the CONSTANT and CONTROL.
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Qualitative and quanitative are two types of variables.
An equation with two variables . . . seriously!An equation with one variable can be can be solved, but when there are two variables, you need two equations. This is called a system of two equations in two variables.Three equations in three variables, etc.
A line graph is the most useful type of graph for showing the relationship between two numerical variables. A bar graph can also be used since these two types of graphs are straightforward and simple.
a diagram that tells how two variables are related
Straight line equations have two variables in the form of x and y