# Introduction to Slope of a Line

- Author:
- Jeffrey J. Steckroth

- Topic:
- Equations

Use the two sliders to change the appearance of the line. Watch how the slope value (m) affects the direction and steepness of the line. Adjust the value of b and see how the graph changes. Based upon the value of b and the location of the line, what should we call the value of b?

Draw a line with a slope of 1 and a b value of zero.
(1) What angle does this line make with the x-axis?
(2) How do the values of x and y compare at different points on the line?
(3) Why do you think this is called the "identity function?"