11.2

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by Si Eun Choi1 view·Updated May 10, 2022
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  1. Hi. So I will be presenting my 11.2 presentation over 6.1
  2. about slope intercept form where we're finding our slope
  3. intercept form from two points and from the graph.
  4. So first I have a graph ready
  5. And we're going to find two points.
  6. And the 0.1 I found was negative one on the X axis and negative three on the y axis.
  7. And from my 30.2 I used zero from the X axis and the negative five from the Y axis.
  8. So from the .12.2 we need to go down by two and one to the right.
  9. But from that we already know rise over run so our rises negative
  10. too because we went down by two therefore are still based native to
  11. we have it
  12. easy. Okay,
  13. now we're going to find our X.
  14. I mean y intercept
  15. and our y intercept
  16. Is literally any point where the X is zero.
  17. So
  18. You can spot or zero
  19. and look up and down and there we see a point
  20. and you
  21. Most bottom, which is -5.
  22. And there are a lot
  23. Y intercept is
  24. notified
  25. and that was your point too.
  26. But yeah. Okay.
  27. So now that we have our slope and y intercept,
  28. we can put in our interest and form
  29. in the Y it goes mx plus B
  30. equation.
  31. Now, because the slope is m and y intercept is B.
  32. When we plug that in our slow intercept form would be y equals -2 X -5.
  33. Okay.
  34. And
  35. another way to find our slope intercept form is from
  36. two points using our formula Y two minus Y.
  37. One
  38. Over X 2 -11.
  39. So I'm going to use the first
  40. first point negative 3/1, negative three as
  41. negative
  42. three. S X. One and one S. Y. One
  43. and zero
  44. As X. two. and native a
  45. by Y. two.
  46. Now because we're subtracting Y to by Y one over X two
  47. minus X one. Um subtracting negative eight
  48. negative A. Buy one
  49. and zero
  50. by negative three.
  51. And when we subtract all that
  52. negative eight
  53. subtracted by one is negative nine and zero subtracted by negative three will be
  54. a positive three because there is subtracting
  55. and a negative that's the tricky part.
  56. And there we have negative 9/3.
  57. And when we simplify we get a total of negative three and that is our slope
  58. and
  59. might look a little complicated efforts looking at
  60. the graph and everything but it's not.
  61. And this section is
  62. one of
  63. these sections I
  64. didn't get at first but I actually
  65. enjoyed it.
  66. Okay
  67. and from this graph,
  68. if you refer it into like a real life problem,
  69. it's like
  70. the first day
  71. You borrowed $5 from your mom. So it's like a negative because you
  72. kind of owe her
  73. And every other day,
  74. every other day after that you keep borrowing $2 every day like more
  75. so
  76. that's being more negative
  77. because you're borrowing every day
  78. like.
  79. And these kind of graphs.
  80. And soap intercept form can really like help you understand real life
  81. problems better by using like initial value and the rate of change.
  82. So that's it. Thank you.