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### Course: Pre-algebra>Unit 13

Lesson 1: Graphing proportional relationships

# Graphing proportional relationships: unit rate

In proportional relationships, the unit rate is the slope of the line. Changes in x lead to steady changes in y when there's a proportional relationship. We can use the unit rate to write and graph an equation of the line that represents the relationship. Created by Sal Khan.

## Want to join the conversation?

• Why am I still doing this I have no life...
• really why would you say that don't know what the future holds
• At , why is constant represented with a k? And if c represents something else, what is that term?
• c stands for the speed of light, a very specific number.
• How do you find the rate of change
• When the value of x increases, the value of y remains constant. That is, there is no change in y value and the graph is a horizontal line.
• Why is math HARD,I practice and watch the videos more than once and I dont know to be getting better
what do I do?
• Here are some questions to ask yourself, to identify the difficulty.

1) What kinds of errors, if any, am l making that cause me to answer the problems incorrectly?

2) ls there a lower level skill l’m missing that is needed to solve these problems?

3) Do l tend to learn math only by rote, instead of aiming for a deeper level of understanding?
• When your last name is khan :D
• Oh, wow! But you should comment that in the Tips & Thanks btw
(1 vote)
• can math solve what is the probability of death?
• Pretty much there is a 100% probability of death.
• i like the airplane in the background lol
• I think it’s a car