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IM 8.3.10 Lesson: Calculating Slope

Author:GeoGebra Classroom Activities, IM 6 – 8 Math

Find values for and that make each side have the same value.

Plot the points (1, 11) and (8, 2), and the line that passes through them.

Without calculating, do you expect the slope of the line through and to be positive or negative?

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

How can you tell?

Calculate the slope of this line.

Find the value of k so that the line passing through each pair of points has the given slope.

and , slope = 2

and , slope = -2

and , slope =

and , slope =

and , slope= 0

Your teacher will give you either a design or a blank graph. Do not show your card to your partner.

If your teacher gives you the design:If your teacher gives you the blank graph:
  1. Look at the design silently and think about how
  2. you could communicate what your partner should draw. Think about ways that you can describe what a line looks like, such as its slope or points that it goes through.
  3. Describe each line, one at a time, and give your partner time to draw them.
  4. Once your partner thinks they have drawn all the lines you described, only then should you show them the design.
  1. Listen carefully as your partner describes each line, and draw each line based on their description.
  2. You are not allowed to ask for more information about a line than what your partner tells you.
  3. Do not show your drawing to your partner until you have finished drawing all the lines they describe.
When finished, place the drawing next to the card with the design so that you and your partner can both see them. How is the drawing the same as the design? How is it different? Discuss any miscommunication that might have caused the drawing to look different from the design. Pause here so your teacher can review your work. When your teacher gives you a new set of cards, switch roles for the second problem.

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