A real-world situation that can be modeled with a two-variable linear equation is a situation in which two variables, such as time and cost, are related in a linear fashion. The y-intercept of the line represents the point where the line crosses the y-axis, or the value of the dependent variable when the independent variable is zero. The x-intercept of the line represents the point where the line crosses the x-axis, or the value of the independent variable when the dependent variable is zero. The slope of the line represents the rate of change between the two variables; it is the ratio of the change in the dependent variable over the change in the independent variable.
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