1. 1 Math Supplement The Proportionality A “is proportional to” B

2. 2 Math Supplement The Proportionality A “is proportional to” B A α B

3. 3 Math Supplement The Proportionality A “is proportional to” B A α B A = (constant) B The constant is called the Constant of Proportionality

4. 4 Math Supplement The Proportionality A α B A = (constant) B Equation of a line y = mx +b m = slope b = y intercept A B The slope of the line is equal to the constant of proportionality For a strict proportionality, b = 0

5. 5 Math Supplement The Proportionality A α B A = (constant) B Equation of a line y = mx +b m = slope b = y intercept A B “High” slope “Low” slope