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### Course: MAP Recommended Practice>Unit 19

Lesson 13: Graphing proportional relationships

# Rates & proportional relationships example

Let's compare unit rates in equations and graphs. Learn how a change in 'x' affects 'y' in an equation like y = 6.5x, and see how this compares to the rate of change in a graph. Uncover why one might increase at a slower pace than the other. Created by Sal Khan.

## Want to join the conversation?

• This is very confusing. can someone explain it?
• You will have to be more specific find the spot in the video and ask about that part.
• what does ambiguous mean
• Ambiguous means unclear or having multiple meanings. You 𝘤𝘢𝘯 look it up.
• anyone else not get this?
• Yes! I don't understand well, too.
• im just so confused i don't understand very well
• How would you do it if it was,

A giraffe grows 3-10 inches per day,

Which of the following equations, where t represents time in days, and H represents height in centimeters, could be descriptions of the growth of the giraffes height?

H=1.1t
H=2.5t
H=7.1t
H=9.3t

Thanks for helping me!
• So you said that the giraffe grows between 3-10 cm a day..
Where t = days an h = height.

So there can be more than one answer because we don’t how how much exactly it grows..
So the answers would be between 3 and 10.
3) H = 7.1t
4) H = 9.3t
Those were the only 2 possible answers in the given options..

Hope this helped
• So in the video the question is, "is y=6.5x a slower unit rate (the unit rate is 6.5)then the unit rate shown in the graph. The graphs unit rate is y=3.5x (where 3.5 is the unit rate). So if you compare the two unit rates, 6.5(sentence unit rate) and 3.5(graph unit rate), 3.5 is the slower unit rate. Hope this helps :}
• What if all of the rates are not equal would the answer still be the smae?
• It depends on the rates