IXL - Rate of change: graphs (Algebra 1 practice)

Kristen kept a tally of the number of emails she received each day for a week.

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

emails per day

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Learn with an example

question

Mrs. Goodman hosts an annual art contest for kids, and she keeps a record of the number of entries each year.

According to the graph, what was the rate of change between 2015 and 2016?

entries 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

entries

–

entries

2,016

–

2,015

entries

–

entries

year

entry

year

entry per year

The rate of change between 2015 and 2016 was

entry per year

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Teacher tools

Work it out

Not feeling ready yet? These can help:

K.1Find the slope of a graph

K.2Find the slope from two points

II.16Interpret line graphs

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