Analyzing Proportional Relationship Graphs

Graphs of Proportional Relationships

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Graphs of Proportional Relationships

The coordinate grid shows the graphs of five proportional relationships.

  • Approximate, as closely as possible, the constant of proportionality for each line.
  • The graph of a proportional relationship with a constant of 1 would lie between two of these lines. Explain why.


  • If you can find one point on the line, how can you determine the constant of proportionality?
  • What would a line with a constant of proportionality of 1 look like? What are some examples of ordered pairs that have a ratio of 1?