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### Course: 8th grade (Illustrative Mathematics)>Unit 3

Lesson 1: Lesson 3: Representing proportional relationships

# Graphing proportional relationships from an equation

Sal graphs the equation of a line that represents a proportional relationship given an equation. Created by Sal Khan.

## Want to join the conversation?

• i still don't understand how to do these :( • First start with an equation, like y = 4x. Next, plug in a number as x, like 5. Since you would need to multiply it by 4 to find y,(hence the 4x), That means that the y would be equal to 20.
So, in the end, a point on your graph would be (5,20). To find other points, you would plug in any other number as x, and that would get you your line.

Does that help? • I don't get any of this. PLZ help! • i like chicken • i dont understand • I look in the question bar for help and everyone's as lost as I am. • At , how can Y change 12.5? • is math related to science
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