Proportional Relationships
A relationship where the ratio between two quantities stays the same.
What is a proportional relationship?
A table where the ratio y/x changes.
What is a non‑proportional relationship?
In a proportional relationship, this value represents the constant multiplier between x and y.
What is the constant of proportionality?
If a car travels 120 miles in 3 hours, this is the unit rate.
What is 40 miles per hour?
A table that shows pairs (1,4),(2,8),(3,12).
What is a proportional relationship with a constant of proportionality of 4?
The graph of y=3x.
What is a straight line that passes through the origin?
The equation y=6x represents earning $6 per hour.
What is a proportional relationship where the unit rate is $6 per hour?
A real‑world situation where total cost depends only on cost per item and number of items with no start fee.
What is a proportional relationship?
A graph of a proportional relationship always has this point.
What is the origin (0,0)?
The equation that represents a situation where each notebook costs $2 and you buy x notebooks.
What is y=2x?