Identifying Proportional Relationships

1. Explain, in your own words, what a proportional relationship is and provide a real-world example not mentioned in the video.

2. In the equation y = kx, 'k' represents the constant of proportionality. If you are given a table of x and y values, describe the steps you would take to find the value of 'k'.

3. Sarah is selling lemonade. The cost to make the lemonade is $2, and she sells each cup for $0.75. Write an equation that shows the relationship between the number of cups she sells (x) and her profit (y). Is this a proportional relationship? Explain why or why not.