Straight Line Model Demo

1
Straight Line Model Demo

• Elementary Math ModelsSpring 2015

2
Graph Found on Internet

• http//www.statcan.gc.ca/edu/image/LinearExPreg.gi
  f

3
Modified Version

• Relabel axes
• Define variables x years after 1992
  y number of events (thousands)

4
Add a straight line

• Draw it as close as possible to all the points

5
Pick Two Points

• Choose points on the line
• Far apart to improve accuracy
• Close to grid points if possible

6
Find the Slope

• Slope rise over run -50/5 -10
• Units thousands of events per year

7
Find the Equation

• Point-slope with point (3,500) and m -10
• y 500 -10(x-3) -10x 30
• y -10x 530