8th Grade Videos - Understand the connections between proportional relationships, lines, and linear equations.

Graph proportional relationships, interpreting the unit rate as the slope of the graph. Compare two different proportional relationships represented in different ways. For example, compare a distance-time graph to a distance-time equation to determine which of two moving objects has greater speed.

Use similar triangles to explain why the slope m is the same between any two distinct points on a non-vertical line in the coordinate plane; derive the equation y = mx for a line through the origin and the equation y = mx + b for a line intercepting the vertical axis at b.

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Graphing Distance and Time
Students learn that distance and time can be represented on a graph. They also learn that steepness of a line segment on a distance?Ǩtime graph can tell you how quickly an object was traveling during a certain period.

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