Final answer:
A line drawn from one point to another on a chart is called a line graph, which visualizes the relationship between two variables over time.
Step-by-step explanation:
A line drawn from one point to another on a chart is called a line graph. Line graphs are especially useful in visualizing how a data point or a series of data points changes over time, helping to identify trends and patterns. The defining characteristic of line graphs is that they show a relationship between two variables, which are commonly represented with one measured on the horizontal axis (also known as the x-axis) and the other on the vertical axis (or y-axis). When plotting a line graph, the graph of a linear equation such as y = a + bx would appear as a straight line on the chart, provided that the line is not vertical.