Post on 27-May-2020
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Reporting Strand 4: Graphs of Functions
CCSS Instructional Focus Understand Solutions (A.REI.10) Understand that all solutions to an equation in two variables are contained on the
graph of that equation. Graph Functions (F.IF.7b) Graph a variety of functions expressed symbolically, including all of the following:
linear, piecewise, absolute value, and step
1. The following equation represents a linear equation: π¦ = 2π₯ β 4 Sketch the linear equation using an x-Ββ & y-Ββtable. An x-Ββ & y-Ββtable is a method that you can use to graph any type of equation that is new to you; however, once we learn a method of graphing you may not use an x-Ββ & y-Ββtable.
LINEAR EQUATIONS
SLOPE
Y-ΒβINTERCEPT
SLOPE-ΒβINTERCEPT FORM
POINT-ΒβSLOPE FORM
STANDARD FORM
SLOPE-ΒβREFERENCE GUIDE
Find the slope of the line that passes through each pair of points. 2. (0, 0), (3, 3) 3. (4, 4), (5, 3) 4. (β3, 4), (4, 4) 5. (β2,β4), (β2, 3)
π¦ β π¦! = π(π₯ β π₯!) (point-Ββslope form)
π¦ β 3 = 5(π₯ + 4)
3π₯ β 2π¦ = 4 (standard form)
6. Find the slope given the following lines.
7. Find the slope from the following table of value. x y 1 8 4 2 5 0 10 -Ββ10
Find the slope and y-Ββintercepts for the following equations. 8. π¦ = 6π₯ β 4 9. π¦ β 2 = β3π₯ 10. 4π₯ + 2π¦ = 6
11a. Which of the following points lie on the line of the graph shown to the right? a. (3, 8) b. (-Ββ1, 2) c. (15, 20) d. (-Ββ6, -Ββ1) e. (-Ββ13, -Ββ7)
11b. How many points would satisfy the equation of the line shown? 11c. What are all the solutions to the equation of the line? Given the following linear equations, identify which solutions would lie on the line of the equations. 12. π¦ = β !
!π₯ β 6 13. π¦ β 3 = 2(π₯ + 4)
a. (2, 7) a. (3, 17) b. (4, -Ββ8) b. (-Ββ5, 1) c. (-Ββ2, -Ββ5) c. (-Ββ0.5, 10) d. (32, -Ββ22) d. (5, 17) e. (6, 3) e. (-Ββ5, -Ββ3)
How many points would satisfy the equations in #12-Ββ13? What are all the solutions to the equations of these lines? Each pair of points lies on a line with the given slope. Find x or y.
14. 4, 3 , 5, π¦ ; π ππππ = 3
15. 3, π¦ , 1, 9 ; π ππππ = β !
!
16. (3, 5), (π₯, 2); π’ππππππππ π ππππ
Graph the following equations. 17. π¦ = β !
!π₯ β 4
18. Graph the equation: β2(3π₯ + 4) + π¦ = 0
19. π¦ β 4 = 3 π₯ + 2 20. π¦ β 1 = !! (π₯ β 2)
21. π¦ = !
! π₯ + 2 22. 6π₯ + 3π¦ = 9
Write the equation in slope-Ββintercept form of the line that passes through the given points. Then find the x-Ββ and y-Ββintercepts of the line. 23. β2,β1 πππ 4, 2 24. β2, 4 , πππ 3,β1 25. (β6, 5) πππ (1, 0)
Write the equation of the line in point-Ββslope form. Then transform the equation into slope-Ββintercept form. 26. 3,β8 ; π = β !
! 27. (β1,β2), (2, 4) 28. (β6, 6), (3, 3)
29. Evaluate the function for the given value of x.
π π₯ =3, ππ π₯ β€ 02, ππ π₯ > 0 π π₯ =
π₯ + 5, ππ π₯ β€ 32π₯ β 1, ππ π₯ > 3 β π₯ =
!!π₯ β 4, ππ π₯ β€ β23 β 2π₯, ππ π₯ > β2
π 2 = π β4 = π 0 = π !
!=
π 7 = π 0 = π β1 = π 3 = β β4 = β β2 = β β1 = β 6 = 30. Evaluate the function for the given value of x.
π π₯ = 3π₯ β 5, π₯ > 4π₯!, π₯ β€ 4
π 7 = π 4 = π β3 = 31. Evaluate the function for the given value of x.
π π₯ =β2 π₯ + 1 , π₯ β€ 13, 1 < π₯ < 36 β 2π₯, π₯ β₯ 3
π 10 = π 2 = π 0 =
PIECEWISE LINEAR EQUATIONS
Graph the following piecewise linear functions.
32. π π₯ =π₯ + 3, ππ π₯ β€ 02π₯, ππ π₯ > 0 33. π π₯ = β2, π₯ < 0
3, π₯ β₯ 0
34. π π₯ = βπ₯ + 2, π₯ < 2π₯ β 2, π₯ β₯ 2 35. π π₯ =
4π₯ β 2, π₯ β₯ 2β !
!+ 4, π₯ < 2
36. π π₯ = π₯ + 5, π₯ < β2β2π₯ β 1, π₯ β₯ β2 37. π π₯ =
2π₯ + 1, π₯ β₯ 1!!π₯ β 3, π₯ < 1
We will graph the absolute value equation of π¦ = |π₯| to see the general shape of absolute value functions.
x y -Ββ3 -Ββ2 -Ββ1 0 1 2 3
ABSOLUTE VALUE EQUATIONS
Graph the following absolute value functions. 38. π π₯ = !
!π₯ β 2 + 5 39. π π₯ = |π₯ + 3|
40. π π₯ = β2 π₯ β 1 41. π π₯ = 3 π₯ β !
!
41. π π₯ = β π₯ β 3 β 4
STEP EQUATIONS Floor functions Ceiling Functions
(round down always) (round up always)
π π₯ = π₯ π π₯ = π₯
GENERAL TIPS
42. π π₯ = π₯ + 4 43. π π₯ = π₯ + 2
44. β π₯ = 3 π₯ 45. π π₯ = !
!π₯
46. π¦ = 2π₯ 47. π¦ = β !
!π₯
PARENT FUNCTIONS Linear Absolute Value
Square Root Quadratic
Cubic
TRANSFORMATIONS
Transformation Appearance in Function Vertical Translation Up π π₯ + π
Vertical Translation Down π π₯ β π Horizontal Translation Left π(π₯ + β) Horizontal Translation Right π(π₯ β β) Stretch/Compress Vertically ππ π₯
Reflection in x-Ββaxis βπ(π₯) Reflection in y-Ββaxis π(βπ₯)
Describe the transformation that occurred. 48. π¦ = β2 π₯ + 3 ! + 5 49. π¦ = π₯! β 1 50. π π₯ = 2 π₯ β 1 51. β π₯ = π₯ β 2 52.π π₯ = π₯! + 3 53. π π₯ = βπ₯ + 5 β 2 54. π π₯ = 3 π₯ 55. π¦ = βπ₯! + 1 56. π¦ = π₯ β 4 Given the parent function and a description of the transformation(s), write the equation of the transformed function. 57. Absolute value β Vertical shift up 5, horizontal shift right 3 58. Square root β vertical compression (stretch) by !
!
59. Cubic β reflected over the x-Ββaxis and vertical shift down 2 60. Quadratic β horizontal shift left 8 & reflected over the y-Ββaxis 61. Linear β vertical stretch by 5, vertical shift down 3
Graph the following functions using the parent graph. 62. π¦ = 3(π₯ + 1)! 63. π¦ = 2 π₯ + 2 β 3
64. π¦ = β π₯ β 5 65. π¦ = π₯! + 4