7.R.1.a Decide whether two quantities are in a proportional relationship (e.g., by testing for equivalent ratios in a table).
7.R.1.b Represent and solve authentic problems with proportions.
8.A.2.c Graph proportional relationships and interpret the rate of change.
Proportional Relationship
A relationship between two quantities in which their ratio is always the same. A proportional relationship can be represented by an equation such as y = kx.
Proportion
An equation that states that two ratios or rates are equal. Example: ²⁄₃ = ⁶⁄₉
Constant of Proportionality
The constant ratio between two quantities in a proportional relationship. It is represented by k in the equation y = kx.