1 / 17

Point-Slope Equation to fit Data 4.5

Point-Slope Equation to fit Data 4.5. This is our last section, so let’s tie everything together! YAY!. Goal. Write a point-slope equation given a line or a linear scatter plot. . We will want to write an equation for something that looks like this…. Steps!.

lisle
Download Presentation

Point-Slope Equation to fit Data 4.5

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Point-Slope Equation to fit Data4.5 This is our last section, so let’s tie everything together! YAY!

  2. Goal • Write a point-slope equation given a line or a linear scatter plot.

  3. We will want to write an equation for something that looks like this….

  4. Steps! • Find the slope using two points on the line. 2. Pick one point on the line to use in equation. 3. Write general equation: 4. Plug slope and point into equation.

  5. Example We need two things for a point-slope equation. Any Point Slope

  6. Solution Step 1: Slope=2/3 Step 2: Point= (3,3) Step 3: Step 4:

  7. You try!

  8. New type of problem! We are going to be given a scatter plot. We are going to draw a line of best fit AND write an equation for that line in point slope form.

  9. Important • When you draw your line of best fit, make sure it hits at least two points so that we can find the slope.

  10. Example

  11. Example

  12. Solution • Use the two points on the line to find the slope. Then pick one of the points to plug into the equation. • Slope: -2/3 • Point: (3,2) • Equation:

  13. You will try on the homework 

  14. Definition • An x-intercept is the point where the line crosses the x-axis. • So, when y=0, (x,0) • How do we find it? • Plug 0 in for y and solve for x.

  15. Example • Find the x-intercept of the line y=15-5x Solution: y=15-5x 0=15-5x -15 = -5x 3=x X-intercept is 3

  16. You try! • Find the x-intercept of y=10x-60 • Answer: 6

  17. Homework • 4.5 worksheet. All problems.

More Related