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### Course: 7th grade (Illustrative Mathematics)>Unit 2

Lesson 8: Lesson 10: Introducing graphs of proportional relationships

# Identifying proportional relationships from graphs

Worked example identifying proportional relationships from graphs.

## Want to join the conversation?

• So just to make things clear for myself, it has to go through the origin because no multiplication expression has a product of 0 except if at least one of the factors is 0, so if you start at (2,0) there is not a constant factor (you need a constant factor for proportionality) you can use to end in (3,2) am I right?
• Yep, you got it! An easier way to explain it is that if you buy nothing in a proportionally priced store, you will spend nothing.
• I didn’t understand :(
• What didn't you understand? If you explain yourself more fully, people can help you better!
• I attempted to do the assignment, But I couldn't press the check button
• I would recommend pressing the “Report a bug” button. It will show up near the bottom right corner of the work page and you can just tell them that it didn’t work.
• what is the difference between a proportional relationship and a linear equation

I noticed that a proportional relationship needs to go through the origin and the linear equation does not have to go through the origin

can we say that that every proportional relationship is a linear equation but not every proportional relationship is a linear equation ??
• You had the right idea but you didn’t quite say the last part correctly.

Corrected version:
Every proportional relationship is a linear equation but not every linear equation is a proportional relationship.
• my brain isn't braining
• My ideas aren't ideaing anymore
• ima fith grader i don't understand
• This is 8th grade math
• for the first question there are 0 correct proportional relation ships because none of them have a strait line.
• what is a slope
• The steepness of the 'curve/line'. In other words: the difference of the y-value between two points over the change in the x-value.