Comparing linear functions across representations

Compare two functions given as an equation, a table, a graph, and a description.

Standards:8.F.A.2

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

Two phone plans are shown below. Plan A costs $15/month plus $0.10 per text. Plan B costs $25/month with unlimited texts. For how many texts will both plans cost the same amount in one month?

Question 2 of 3

Two phone plans are shown below. Plan A: $25 start fee + $0.10 per text Plan B: $5 start fee + $0.15 per text At how many texts do both plans cost the same?

Question 3 of 3

Two phone plans charge different rates. Plan A costs $25 per month plus $0.10 per text message. Plan B costs $40 per month with unlimited texts. At how many text messages do the two plans cost the same?

How this fits in

Comparing linear functions across representations is one skill in the Linear Functions unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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