IXL | Rate of change: graphs

Worried about going over his storage limit, Desmond monitored the number of undeleted voicemail messages stored on his phone each day.

According to the graph, what was the rate of change between Thursday and Friday?

voicemail messages per day

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Learn with an example

question

To figure out how many vacation days she had left to use, Isabella looked over her old calendars to figure out how many days of vacation she had taken each year.

According to the graph, what was the rate of change between 2018 and 2019?

vacation days per year

key idea

Rate of change

change in value

change in time

solution

Plug the numbers into the formula for rate of change and simplify.

Rate of change

change in value

change in time

vacation days

–

vacation days

2,019

–

2,018

vacation days

–

vacation days

year

–

vacation days

year

–

vacation days per year

The rate of change between 2018 and 2019 was

–

vacation days per year

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Now entering the Challenge Zone—are you ready?

Teacher tools

Work it out

Not feeling ready yet? These can help:

Z.1Find the slope from a graph

Z.2Find the slope from two points

II.16Interpret line graphs

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