Semester 2 Topic 3 Level I

Task Name : Number plumber Task Level : I (Year 8)
Semester : 2 Topic : Lines and Coordinates VC Strand : Linear and non-linear relationships
Web Address :
Equipment Needed : Access to a PC/Android device to access number plumber
Victorian Curriculum outcome : Plot linear relationships on the Cartesian plane with and withoutthe use of digital technologies.
Task description : Students create ten linear equations using number plumber. They are required to create 2 with a positive gradient, 2 with a negative gradient, 2 with a positive x intercept, and 2 with a negative x intercept. For each linear relationship, students need to plot the points they have used and draw the line; identify the equation; and identify the polarity of the gradient, x-intercept and y-intercept.
Assessment options : Photograph of handwritten records; screenshots or a screencast.
Teacher notes : Familiarity with the Number Plumber environment is important to make this and other related tasks work. Take some time to learn how to use it yourself and spend some time showing students how to use it. It is like an advanced version of the “algebra machine” ideas with an input and output.

Downloads : Number Plumber level i

Extension tasks: Plotting a table of values (Desmos)
Speed Graphs (Desmos/Maths300)
Desmos Linear tasks set