Back to Recognize and represent proportional relationships between quantities — Problem 1 · Task Set 3

7.RP.A.2 Tutor Intake -- Recognizing and Representing Proportional Relationships

This short check helps your tutor see where to start. Work each problem on
your own, without a calculator. If you are not sure, give your best try --
every answer helps your tutor plan your first few sessions.

Grade 7·10 problems·~11 min·Common Core Math - Grade 7·standard·7-rp-a-2

Work through problems with immediate feedback

Concepts

A table has one row: when $x = 4$ , $y = 12$ . A student computes
$y/x = 3$ and concludes the relationship is proportional with
constant of proportionality $k = 3$ . What is missing from this
conclusion?

The student should have computed $x/y$ instead of $y/x$ .

Nothing -- one ratio is enough to establish the constant of proportionality.

The student must check that $y/x$ equals 3 for every other pair in the table, not just this one row.

The student needs a graph, not a ratio, to find $k$ .