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Lesson 1: Graphing proportional relationships

# Graphing proportional relationships from an equation

Let's graph the equation y = 2.5x. For every increase of 1 in x, y increases by 2.5. We call this the "unit rate" or "slope". The graph shows a proportional relationship because y changes at a constant rate as x changes and because y is 0 when x is 0. Created by Sal Khan.

## Want to join the conversation?

• i still don't understand how to do these :(
• i like chicken
• me tooo
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• I look in the question bar for help and everyone's as lost as I am.
• Plus all these comments are ancient, no one from my class is active on here apparently. They probably need to get upvoted to be seen so I don't think anyone's reading my comments either.
• I don't get any of this. PLZ help!
• There are pros and Khans to math…lol 😂