#### Understanding

Any line that contains the graph of a collection of equivalent ratios goes through the point (0, 0); however, the point (0, 0) is not a member of the collection.

### What to look for

Unit rates are suggested in some of the questions as good strategies for solving problems. Students should remember that adding two columns in a ratio table produces another ratio equivalent to those added.### Sample Assessment

Mark and Steve bike at the same rate. If it takes Steve
$\frac{1}{4}$
hour to bike 6 miles, how long will it take Mark to bike 8 miles?

Answer: $\frac{1}{3}$ hour