A linear graph is a visual representation of a linear equation, which shows a straight line on a coordinate plane. The equation typically takes the form y = mx + b, where m represents the slope of the line and b is the y-intercept. The slope indicates how steep the line is, while the y-intercept shows where the line crosses the y-axis. Linear graphs are useful for illustrating relationships between two variables. For example, in a graph showing distance over time, the line can help predict how far an object will travel at a constant speed. These graphs are commonly used in fields like mathematics, science, and economics.