5. Bellwork

7. You will need a graphing calculator today!!

8. linear NOT linear

9. y-intercept: y-coordinate of the point where a line crosses the y-axis. y-intercept = 4 slope= -3 8 http://www.phschool.com/atschool/academy123/html/bbapplet_wl-problem- 431001.html

12. y = mx + b slope y-intercept http://www.phschool.com/atschool/academy123/html/bbapplet_wl-problem- 430899.html

13. Homework pp 294-297 2, 6, 10, 22, 23, 32, 35, 41, 45, 47, 50, 52, 56, 57, 62-64

14. Bellwork

35. point-slope form- non-vertical line that passes through point (x,y ) with slope m 1 1 y - y = m ( x - x ) 1 1

36. 11

38. http://www.phschool.com/atschool/academy123/html/bbapplet_wl-problem- 431007.html

42. http://www.phschool.com/atschool/academy123/html/bbapplet_wl-problem- 431009.html

45. http://www.phschool.com/atschool/academy123/html/bbapplet_wl-problem- 431010.html

54. Homework

55. y = mx + b Slope-Intercept Form Slope is easy to find.

56. What is the slope of x = ? What is the slope of y = ? VUXHOY

57. STANDARD FORM Transform Standard Form into Slope-Intercept Form: Step 1Ax + By = C Step 2 By = -Ax + C Step 3 y = -Ax + C B B

58. y = -Ax = C B B What's the slope? m = -A B

59. Example 1: Parallel Lines Parallel lines have exactly the same slope. Equation of red line: y = 1x + 3 2 2 Equation of blue line: y = 1x - 1 2

60. All horizontal lines are parallel and have a slope of what? HOY

61. All vertical lines are parallel and have a slope of what? VUX

62. No matter what form of equation you use, find the slope and you have the slope of all the parallel line.

63. I will give you an equation and a point. Find the slope of the equation. That's all you need the equation for; you are finished with it.

64. Plug the slope and point into the the point-slope form of the equation.

65. Example 2: Perpendicular Lines ·Form right angles where they meet ·Slopes are negative, or opposite, reciprocals ·Product of perpendicular = -1

66. Examples of negative reciprocals 1 and -31 and -1 3 1 -1 and 2 2 1

67. I will give you an equation and a point. Find the slope of the equation. That's all you need the equation for; you are finished with it.

68. Find the negative reciprocal of the slope. - 1 5

69. Plug the slope into the slope-intercept form to write the equation.

72. Homework pp 314 -317 32-50 even 57-59 70