Using Intercepts for Graphing

Math Content: Using Intercepts for Graphing
Instructional Strategy: Visualizing

Ms. Sorci's class determines that the x-intercept of 2x + 3y = 6 is (3,0) and that the y-intercept of 2x + 3y = 6 is (0,2). This information is used to draw the graph of the line represented by this equation.

Often, after the slope-intercept form of a line is taught, students often forget that graphing can be easier using the two intercepts rather than the slope and y-intercept.

Although the graph has already been created, the students aren't sure how to find the coordinates of other points on the same line.

In the clip below, see how Ms. Sorci uses the graph to help them visualize the answer.

 

Classroom Clip Connection:

  • How does Ms. Sorci support her students in finding a correct answer?
  • What other strategies might she use?
  • What are the implications for your own work with students?