Final answer:
The line graph used to represent a relationship between two variables is called a line graph. Line graphs show the relationship between an independent variable and a dependent variable.
Step-by-step explanation:
The line graph used to represent a relationship between two variables is called a line graph.
Line graphs show the relationship between an independent variable (usually plotted on the horizontal or x-axis) and a dependent variable (usually plotted on the vertical or y-axis). They are used to display continuous data and can be used to identify trends, patterns, and correlations.
A line graph consists of individual data points connected by straight lines, forming a line that represents the relationship between the variables being measured.