###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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# Rectangular Coordinate System - Problem 6

Alissa Fong
###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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A line on a graph represents the picture of all of the input-output pairs that make a relationship true. Often, we have infinitely many possible inputs with infinitely many outputs, which creates a "ruler straight" line. In the real world, a straight line would represent a continuous variable- something like how much money you would pay for a certain number of pounds of rice: you can buy partial pounds. This is a continuous linear relationship. Contrast that idea with something discrete, or a separate set of points, that look like a line but we actually don't connect them unless we're showing a trend. Consider if avocados cost \$1 each- you would buy 1, or 2 or 3 avocados and pay \$1 or \$2 or \$3, but you couldn't really buy partial avocados or pay cents on a dollar. This is a discrete linear relationship.

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