Properties of lines
Observations (so far)
The gradient of the line is a measure of its steepness.
The gradient of the line passing through and is
The y-intercept of a line is the value of y where the line cuts the y-axis. When the equation of the line is in the form , the y-intercept is .
*new* The x-intercept of a line is the value of x where the line cuts the x-axis.
In the next applet, you can modify m and c to see how that affects the line. Try different values for both of them and answer the questions.
What is the x-intercept of the line ?
What is the x-intercept of the line
What is the x-intercept of the line ? (Suggestion: if you can't see it in the graph, try to calculate it)
Explain the method to calculate the x-intercept of a line without looking at the graph.