Perpendicular lines

Author:
swharton
Perpendicular lines Use the sliders and the instructions below to explore what happens to the angle between these two lines.
What can you find out about perpendicular lines 1 Make m1 = 2 and m2 = - 1/2. What do you notice about the lines? 2 Write the equations for both lines. 3 Now change the value of c for one of the lines.What happens to the angle between the lines. Write the equations for these new lines. 4 Look at these four equations for straight lines. Can you predict which 2 will be parallel? y = 4x + 2, y = -4x + 2, y = -1/4x + 5, y = 4x + 1/2 5 Use the worksheet to check your prediction. 6 There is a relationship between the equations for perpendicular lines. Can you spot it? This web link might help you www.mathsisfun.com/reciprocal.html