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GeoGebraGeoGebra Classroom

y = mx + c

In this activity, you will use applets to explore the effects of gradient and y-intercept on straight lines.

Question 1

What happens when m (the gradient) is positive?

Select all that apply
  • A
  • B
Check my answer (3)

Question 2

What happens when m (the gradient) is negative?

Select all that apply
  • A
  • B
Check my answer (3)

Question 3

What happens when c (the y-intercept) is positive?

Select all that apply
  • A
  • B
  • C
Check my answer (3)

Question 4

What happens when c (the y-intercept) is negative?

Select all that apply
  • A
  • B
  • C
  • D
  • E
Check my answer (3)

Question 5

What happens when c (the y-intercept) is zero?

Select all that apply
  • A
  • B
  • C
Check my answer (3)

Question 6

Describe the lines where m (the gradient) is zero?

Simultaneous Equations

Question 7

On the graph above, show the graph of y = x + 2. On the same graph, plot the graph of y = 2x - 2 What do you notice about these lines? Are there any special points for these lines? What are the coordinates of these points?