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Tuesday February 9th

Practice determining equations, intercepts, and slopes of lines for a math test. Learn to solve word problems using slope-intercept equations efficiently.

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Tuesday February 9th

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  1. Tuesday February 9th Bell Ringer: What are the x and y intercepts of the graph below?

  2. X intercept: 100 Point: (100,0)

  3. Y intercept: 100 Point: (0,-200)

  4. This week Monday: I CAN review calculating slope and graphing lines Tuesday: I CAN review determining equations of lines and intercepts Wednesday: Slope and equations of lines TEST

  5. Today Tuesday: I CAN review determining equations of lines and intercepts Homework: STUDY

  6. How to study • Look over notes • Redo the review sheets and homeworks • Make notecards • Use mrobyrne.com

  7. Binders HAVE THEM TOMORROW Extra credit if you have them

  8. How to solve word problems with Slope Put the information into (x,y) points and into equations of y=mx+b.

  9. What is the equation of the line that contains these two points.

  10. What we need? m=? b=?

  11. Step 1: Find the slope of the line we have (-3,-1) and (6,-4)

  12. Step 1 continued: Find the slope

  13. What we need: m=-1/3 b=?

  14. Step 2: Find b Replace m with -1/3

  15. Continuing step 2: Find b Plug point (6,-4) for x and y Simplify and solve for b

  16. Step 3: Write the equation What we need: m=-1/3 b=-2

  17. Point Slope form m=slope coordinates of a point on the line

  18. Write the point slope equation of a line that passes through (-1,5) and has a slope of -3. What we need: m=? Point=?

  19. Write the point slope form of an equation for a line that passes through (-1,5) and has a slope of -3. What we need: m=-3 Point=(-1,5)

  20. What we need: m=-3 Point=(-1,5) Replace m with -3 Plug in for x1 and y1

  21. Simplify The equation in point slope form:

  22. Example: What is the y intercept of the line To find the y-intercept let x=0 So, the y-intercept of this line is 2

  23. Example: What is the x intercept of the line To find the x-intercept let y=0 So, the y-intercept of this line is 4

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